diff --git a/agt-module-license/agt-module-license-api/src/main/java/org/agt/module/license/enums/ErrorCodeConstants.java b/agt-module-license/agt-module-license-api/src/main/java/org/agt/module/license/enums/ErrorCodeConstants.java
index dca37de..c57bf3c 100644
--- a/agt-module-license/agt-module-license-api/src/main/java/org/agt/module/license/enums/ErrorCodeConstants.java
+++ b/agt-module-license/agt-module-license-api/src/main/java/org/agt/module/license/enums/ErrorCodeConstants.java
@@ -15,4 +15,5 @@ public interface ErrorCodeConstants {
     ErrorCode PROJECT_NAME_DUPLICATE = new ErrorCode(1_100_001_002, "项目名称`{}`已存在");
     ErrorCode PROJECT_CODE_DUPLICATE = new ErrorCode(1_100_001_003, "项目编号`{}`已存在");
     ErrorCode LICENSE_NOT_EXISTS = new ErrorCode(1_100_002_001, "License不存在");
+    ErrorCode LICENSE_SN_DUPLICATE = new ErrorCode(1_100_001_002, "License SN`{}`已存在");
 }
diff --git a/agt-module-license/agt-module-license-server/src/main/java/org/agt/module/license/controller/admin/license/LicenseController.java b/agt-module-license/agt-module-license-server/src/main/java/org/agt/module/license/controller/admin/license/LicenseController.java
index c470436..f97d08e 100644
--- a/agt-module-license/agt-module-license-server/src/main/java/org/agt/module/license/controller/admin/license/LicenseController.java
+++ b/agt-module-license/agt-module-license-server/src/main/java/org/agt/module/license/controller/admin/license/LicenseController.java
@@ -1,33 +1,38 @@
 package org.agt.module.license.controller.admin.license;
 
-import org.springframework.web.bind.annotation.*;
-import jakarta.annotation.Resource;
-import org.springframework.validation.annotation.Validated;
-import org.springframework.security.access.prepost.PreAuthorize;
-import io.swagger.v3.oas.annotations.tags.Tag;
-import io.swagger.v3.oas.annotations.Parameter;
 import io.swagger.v3.oas.annotations.Operation;
-
-import jakarta.validation.constraints.*;
-import jakarta.validation.*;
-import jakarta.servlet.http.*;
-import java.util.*;
-import java.io.IOException;
-
+import io.swagger.v3.oas.annotations.Parameter;
+import io.swagger.v3.oas.annotations.tags.Tag;
+import jakarta.annotation.Resource;
+import jakarta.servlet.http.HttpServletResponse;
+import jakarta.validation.Valid;
+import org.agt.framework.apilog.core.annotation.ApiAccessLog;
+import org.agt.framework.common.pojo.CommonResult;
 import org.agt.framework.common.pojo.PageParam;
 import org.agt.framework.common.pojo.PageResult;
-import org.agt.framework.common.pojo.CommonResult;
 import org.agt.framework.common.util.object.BeanUtils;
-import static org.agt.framework.common.pojo.CommonResult.success;
-
 import org.agt.framework.excel.core.util.ExcelUtils;
-
-import org.agt.framework.apilog.core.annotation.ApiAccessLog;
-import static org.agt.framework.apilog.core.enums.OperateTypeEnum.*;
-
-import org.agt.module.license.controller.admin.license.vo.*;
+import org.agt.module.license.controller.admin.license.vo.LicensePageReqVO;
+import org.agt.module.license.controller.admin.license.vo.LicenseRespVO;
+import org.agt.module.license.controller.admin.license.vo.LicenseSaveReqVO;
 import org.agt.module.license.dal.dataobject.license.LicenseDO;
 import org.agt.module.license.service.license.LicenseService;
+import org.springframework.security.access.prepost.PreAuthorize;
+import org.springframework.validation.annotation.Validated;
+import org.springframework.web.bind.annotation.DeleteMapping;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.PutMapping;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestParam;
+import org.springframework.web.bind.annotation.RestController;
+
+import java.io.IOException;
+import java.util.List;
+
+import static org.agt.framework.apilog.core.enums.OperateTypeEnum.EXPORT;
+import static org.agt.framework.common.pojo.CommonResult.success;
 
 @Tag(name = "管理后台 - License")
 @RestController
@@ -92,4 +97,10 @@ public class LicenseController {
                         BeanUtils.toBean(list, LicenseRespVO.class));
     }
 
+    @GetMapping("/sn-unique")
+    @Operation(summary = "校验License的sn是否唯一")
+    public CommonResult<Boolean> validateLicenseSnUnique(@RequestParam(value = "sn", required = false) String sn, @RequestParam(value = "id", required = false) Long id) {
+        Boolean isExists = licenseService.validateLicenseSnUnique(sn, id);
+        return success(isExists);
+    }
 }
\ No newline at end of file
diff --git a/agt-module-license/agt-module-license-server/src/main/java/org/agt/module/license/dal/mysql/license/LicenseMapper.java b/agt-module-license/agt-module-license-server/src/main/java/org/agt/module/license/dal/mysql/license/LicenseMapper.java
index 358e838..002201b 100644
--- a/agt-module-license/agt-module-license-server/src/main/java/org/agt/module/license/dal/mysql/license/LicenseMapper.java
+++ b/agt-module-license/agt-module-license-server/src/main/java/org/agt/module/license/dal/mysql/license/LicenseMapper.java
@@ -36,4 +36,7 @@ public interface LicenseMapper extends BaseMapperX<LicenseDO> {
                 .orderByDesc(LicenseDO::getId));
     }
 
+    default LicenseDO selectBySn(String sn) {
+        return selectOne(LicenseDO::getSn, sn);
+    }
 }
\ No newline at end of file
diff --git a/agt-module-license/agt-module-license-server/src/main/java/org/agt/module/license/service/license/LicenseService.java b/agt-module-license/agt-module-license-server/src/main/java/org/agt/module/license/service/license/LicenseService.java
index c13dfbd..f117275 100644
--- a/agt-module-license/agt-module-license-server/src/main/java/org/agt/module/license/service/license/LicenseService.java
+++ b/agt-module-license/agt-module-license-server/src/main/java/org/agt/module/license/service/license/LicenseService.java
@@ -1,11 +1,10 @@
 package org.agt.module.license.service.license;
 
-import java.util.*;
-import jakarta.validation.*;
-import org.agt.module.license.controller.admin.license.vo.*;
-import org.agt.module.license.dal.dataobject.license.LicenseDO;
+import jakarta.validation.Valid;
 import org.agt.framework.common.pojo.PageResult;
-import org.agt.framework.common.pojo.PageParam;
+import org.agt.module.license.controller.admin.license.vo.LicensePageReqVO;
+import org.agt.module.license.controller.admin.license.vo.LicenseSaveReqVO;
+import org.agt.module.license.dal.dataobject.license.LicenseDO;
 
 /**
  * License Service 接口
@@ -52,4 +51,12 @@ public interface LicenseService {
      */
     PageResult<LicenseDO> getLicensePage(LicensePageReqVO pageReqVO);
 
+    /**
+     * 校验License的sn是否唯一
+     *
+     * @param sn sn
+     * @param id id
+     * @return boolean
+     */
+    Boolean validateLicenseSnUnique(String sn, Long id);
 }
\ No newline at end of file
diff --git a/agt-module-license/agt-module-license-server/src/main/java/org/agt/module/license/service/license/LicenseServiceImpl.java b/agt-module-license/agt-module-license-server/src/main/java/org/agt/module/license/service/license/LicenseServiceImpl.java
index 0b512a9..f7d70c5 100644
--- a/agt-module-license/agt-module-license-server/src/main/java/org/agt/module/license/service/license/LicenseServiceImpl.java
+++ b/agt-module-license/agt-module-license-server/src/main/java/org/agt/module/license/service/license/LicenseServiceImpl.java
@@ -1,21 +1,19 @@
 package org.agt.module.license.service.license;
 
-import org.springframework.stereotype.Service;
+import cn.hutool.core.util.StrUtil;
 import jakarta.annotation.Resource;
-import org.springframework.validation.annotation.Validated;
-import org.springframework.transaction.annotation.Transactional;
-
-import java.util.*;
-import org.agt.module.license.controller.admin.license.vo.*;
-import org.agt.module.license.dal.dataobject.license.LicenseDO;
 import org.agt.framework.common.pojo.PageResult;
-import org.agt.framework.common.pojo.PageParam;
 import org.agt.framework.common.util.object.BeanUtils;
-
+import org.agt.module.license.controller.admin.license.vo.LicensePageReqVO;
+import org.agt.module.license.controller.admin.license.vo.LicenseSaveReqVO;
+import org.agt.module.license.dal.dataobject.license.LicenseDO;
 import org.agt.module.license.dal.mysql.license.LicenseMapper;
+import org.springframework.stereotype.Service;
+import org.springframework.validation.annotation.Validated;
 
 import static org.agt.framework.common.exception.util.ServiceExceptionUtil.exception;
-import static org.agt.module.license.enums.ErrorCodeConstants.*;
+import static org.agt.module.license.enums.ErrorCodeConstants.LICENSE_NOT_EXISTS;
+import static org.agt.module.license.enums.ErrorCodeConstants.LICENSE_SN_DUPLICATE;
 
 /**
  * License Service 实现类
@@ -31,6 +29,10 @@ public class LicenseServiceImpl implements LicenseService {
 
     @Override
     public Long createLicense(LicenseSaveReqVO createReqVO) {
+        // 校验项目Sn是否唯一
+        if (!validateLicenseSnUnique(createReqVO.getSn(), createReqVO.getId())) {
+            throw exception(LICENSE_SN_DUPLICATE, createReqVO.getSn());
+        }
         // 插入
         LicenseDO license = BeanUtils.toBean(createReqVO, LicenseDO.class);
         licenseMapper.insert(license);
@@ -40,6 +42,10 @@ public class LicenseServiceImpl implements LicenseService {
 
     @Override
     public void updateLicense(LicenseSaveReqVO updateReqVO) {
+        // 校验项目Sn是否唯一
+        if (!validateLicenseSnUnique(updateReqVO.getSn(), updateReqVO.getId())) {
+            throw exception(LICENSE_SN_DUPLICATE, updateReqVO.getSn());
+        }
         // 校验存在
         validateLicenseExists(updateReqVO.getId());
         // 更新
@@ -71,4 +77,22 @@ public class LicenseServiceImpl implements LicenseService {
         return licenseMapper.selectPage(pageReqVO);
     }
 
+    @Override
+    public Boolean validateLicenseSnUnique(String sn, Long id) {
+        if (StrUtil.isBlank(sn)) {
+            return true;
+        }
+        LicenseDO license = licenseMapper.selectBySn(sn);
+        if (license == null) {
+            return true;
+        }
+        // 如果 id 为空，说明不用比较是否为相同 id 的License
+        if (id == null) {
+            return false;
+        }
+        if (!license.getId().equals(id)) {
+            return false;
+        }
+        return true;
+    }
 }
\ No newline at end of file