diff --git a/ruoyi-admin/src/main/java/com/ruoyi/web/controller/workflow/WfCategoryController.java b/ruoyi-admin/src/main/java/com/ruoyi/web/controller/workflow/WfCategoryController.java
index dbd9bb1a..f70a95d4 100644
--- a/ruoyi-admin/src/main/java/com/ruoyi/web/controller/workflow/WfCategoryController.java
+++ b/ruoyi-admin/src/main/java/com/ruoyi/web/controller/workflow/WfCategoryController.java
@@ -4,6 +4,7 @@ import cn.dev33.satoken.annotation.SaCheckLogin;
 import cn.dev33.satoken.annotation.SaCheckPermission;
 import com.ruoyi.common.annotation.Log;
 import com.ruoyi.common.annotation.RepeatSubmit;
+import com.ruoyi.common.constant.UserConstants;
 import com.ruoyi.common.core.controller.BaseController;
 import com.ruoyi.common.core.domain.PageQuery;
 import com.ruoyi.common.core.domain.R;
@@ -87,6 +88,9 @@ public class WfCategoryController extends BaseController {
     @RepeatSubmit()
     @PostMapping()
     public R<Void> add(@Validated(AddGroup.class) @RequestBody WfCategoryBo categoryBo) {
+        if (UserConstants.NOT_UNIQUE.equals(categoryService.checkCategoryCodeUnique(categoryBo.getCode()))) {
+            return R.fail("新增流程分类'" + categoryBo.getCategoryName() + "'失败，流程编码已存在");
+        }
         return toAjax(categoryService.insertCategory(categoryBo));
     }
 
@@ -98,6 +102,9 @@ public class WfCategoryController extends BaseController {
     @RepeatSubmit()
     @PutMapping()
     public R<Void> edit(@Validated(EditGroup.class) @RequestBody WfCategoryBo categoryBo) {
+        if (UserConstants.NOT_UNIQUE.equals(categoryService.checkCategoryCodeUnique(categoryBo.getCode()))) {
+            return R.fail("修改流程分类'" + categoryBo.getCategoryName() + "'失败，流程编码已存在");
+        }
         return toAjax(categoryService.updateCategory(categoryBo));
     }
 
diff --git a/ruoyi-system/src/main/java/com/ruoyi/workflow/service/IWfCategoryService.java b/ruoyi-system/src/main/java/com/ruoyi/workflow/service/IWfCategoryService.java
index 9bf8b173..4d982812 100644
--- a/ruoyi-system/src/main/java/com/ruoyi/workflow/service/IWfCategoryService.java
+++ b/ruoyi-system/src/main/java/com/ruoyi/workflow/service/IWfCategoryService.java
@@ -53,4 +53,12 @@ public interface IWfCategoryService {
      * @return 结果
      */
     int deleteWithValidByIds(Collection<Long> ids, Boolean isValid);
+
+    /**
+     * 校验分类编码是否唯一
+     *
+     * @param code 分类编码
+     * @return 结果
+     */
+    String checkCategoryCodeUnique(String code);
 }
diff --git a/ruoyi-system/src/main/java/com/ruoyi/workflow/service/impl/WfCategoryServiceImpl.java b/ruoyi-system/src/main/java/com/ruoyi/workflow/service/impl/WfCategoryServiceImpl.java
index 25b70af8..a13973ed 100644
--- a/ruoyi-system/src/main/java/com/ruoyi/workflow/service/impl/WfCategoryServiceImpl.java
+++ b/ruoyi-system/src/main/java/com/ruoyi/workflow/service/impl/WfCategoryServiceImpl.java
@@ -4,6 +4,7 @@ import cn.hutool.core.bean.BeanUtil;
 import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
 import com.baomidou.mybatisplus.core.toolkit.Wrappers;
 import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
+import com.ruoyi.common.constant.UserConstants;
 import com.ruoyi.common.core.domain.PageQuery;
 import com.ruoyi.common.core.page.TableDataInfo;
 import com.ruoyi.common.utils.StringUtils;
@@ -76,4 +77,19 @@ public class WfCategoryServiceImpl implements IWfCategoryService {
         }
         return baseMapper.deleteBatchIds(ids);
     }
+
+    /**
+     * 校验分类编码是否唯一
+     *
+     * @param code 分类编码
+     * @return 结果
+     */
+    @Override
+    public String checkCategoryCodeUnique(String code) {
+        boolean exist = baseMapper.exists(new LambdaQueryWrapper<WfCategory>().eq(WfCategory::getCode, code));
+        if (exist) {
+            return UserConstants.NOT_UNIQUE;
+        }
+        return UserConstants.UNIQUE;
+    }
 }