diff --git a/ruoyi-modules/ruoyi-system/src/main/java/org/dromara/system/controller/system/SysDictDataController.java b/ruoyi-modules/ruoyi-system/src/main/java/org/dromara/system/controller/system/SysDictDataController.java
index f978e91c..f46fd549 100644
--- a/ruoyi-modules/ruoyi-system/src/main/java/org/dromara/system/controller/system/SysDictDataController.java
+++ b/ruoyi-modules/ruoyi-system/src/main/java/org/dromara/system/controller/system/SysDictDataController.java
@@ -87,6 +87,9 @@ public class SysDictDataController extends BaseController {
     @Log(title = "字典数据", businessType = BusinessType.INSERT)
     @PostMapping
     public R<Void> add(@Validated @RequestBody SysDictDataBo dict) {
+        if (!dictDataService.checkDictDataUnique(dict)) {
+            return R.fail("新增字典数据'" + dict.getDictValue() + "'失败，字典键值已存在");
+        }
         dictDataService.insertDictData(dict);
         return R.ok();
     }
@@ -98,6 +101,9 @@ public class SysDictDataController extends BaseController {
     @Log(title = "字典数据", businessType = BusinessType.UPDATE)
     @PutMapping
     public R<Void> edit(@Validated @RequestBody SysDictDataBo dict) {
+        if (!dictDataService.checkDictDataUnique(dict)) {
+            return R.fail("新增字典数据'" + dict.getDictValue() + "'失败，字典键值已存在");
+        }
         dictDataService.updateDictData(dict);
         return R.ok();
     }
diff --git a/ruoyi-modules/ruoyi-system/src/main/java/org/dromara/system/service/ISysDictDataService.java b/ruoyi-modules/ruoyi-system/src/main/java/org/dromara/system/service/ISysDictDataService.java
index 30442cec..0e697db6 100644
--- a/ruoyi-modules/ruoyi-system/src/main/java/org/dromara/system/service/ISysDictDataService.java
+++ b/ruoyi-modules/ruoyi-system/src/main/java/org/dromara/system/service/ISysDictDataService.java
@@ -64,4 +64,13 @@ public interface ISysDictDataService {
      * @return 结果
      */
     List<SysDictDataVo> updateDictData(SysDictDataBo bo);
+
+    /**
+     * 校验字典键值是否唯一
+     *
+     * @param dict 字典数据
+     * @return 结果
+     */
+    boolean checkDictDataUnique(SysDictDataBo dict);
+
 }
diff --git a/ruoyi-modules/ruoyi-system/src/main/java/org/dromara/system/service/impl/SysDictDataServiceImpl.java b/ruoyi-modules/ruoyi-system/src/main/java/org/dromara/system/service/impl/SysDictDataServiceImpl.java
index c0a62c7e..bf846e6a 100644
--- a/ruoyi-modules/ruoyi-system/src/main/java/org/dromara/system/service/impl/SysDictDataServiceImpl.java
+++ b/ruoyi-modules/ruoyi-system/src/main/java/org/dromara/system/service/impl/SysDictDataServiceImpl.java
@@ -1,5 +1,6 @@
 package org.dromara.system.service.impl;
 
+import cn.hutool.core.util.ObjectUtil;
 import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
 import com.baomidou.mybatisplus.core.toolkit.Wrappers;
 import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
@@ -135,4 +136,21 @@ public class SysDictDataServiceImpl implements ISysDictDataService {
         throw new ServiceException("操作失败");
     }
 
+    /**
+     * 校验字典键值是否唯一
+     *
+     * @param dict 字典数据
+     * @return 结果
+     */
+    @Override
+    public boolean checkDictDataUnique(SysDictDataBo dict) {
+        Long dictCode = ObjectUtil.isNull(dict.getDictCode()) ? -1L : dict.getDictCode();
+        SysDictData entity = baseMapper.selectOne(new LambdaQueryWrapper<SysDictData>()
+            .eq(SysDictData::getDictType, dict.getDictType()).eq(SysDictData::getDictValue, dict.getDictValue()));
+        if (ObjectUtil.isNotNull(entity) && !dictCode.equals(entity.getDictCode())) {
+            return false;
+        }
+        return true;
+    }
+
 }