diff --git a/ruoyi-modules/ruoyi-oa/src/main/java/org/dromara/oa/erp/service/impl/ErpContractInfoServiceImpl.java b/ruoyi-modules/ruoyi-oa/src/main/java/org/dromara/oa/erp/service/impl/ErpContractInfoServiceImpl.java
index a5061592..a635b883 100644
--- a/ruoyi-modules/ruoyi-oa/src/main/java/org/dromara/oa/erp/service/impl/ErpContractInfoServiceImpl.java
+++ b/ruoyi-modules/ruoyi-oa/src/main/java/org/dromara/oa/erp/service/impl/ErpContractInfoServiceImpl.java
@@ -4,6 +4,7 @@ import cn.hutool.core.bean.BeanUtil;
 import cn.hutool.core.convert.Convert;
 import cn.hutool.core.convert.NumberChineseFormatter;
 import cn.hutool.core.map.MapUtil;
+import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
 import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
 import com.deepoove.poi.data.RowRenderData;
 import com.deepoove.poi.data.Rows;
@@ -389,6 +390,18 @@ public class ErpContractInfoServiceImpl implements IErpContractInfoService {
      * 保存前的数据校验
      */
     private void validEntityBeforeSave(ErpContractInfo entity) {
+        // 校验合同编号不能重复（编辑时排除自身）
+        if (entity != null && StringUtils.isNotBlank(entity.getContractCode())) {
+            LambdaQueryWrapper<ErpContractInfo> lqw = new LambdaQueryWrapper<ErpContractInfo>()
+                .eq(ErpContractInfo::getContractCode, entity.getContractCode())
+                .eq(ErpContractInfo::getDelFlag, "0")
+                .ne(entity.getContractId() != null, ErpContractInfo::getContractId, entity.getContractId());
+            Long cnt = baseMapper.selectCount(lqw);
+            if (cnt != null && cnt > 0) {
+                throw new ServiceException("合同编号【" + entity.getContractCode() + "】已存在，请勿重复");
+            }
+        }
+
         // 校验客户基础信息是否已完善（附件、税号、开户银行、银行账号不能为空）
         Long oneCustomerId = entity.getOneCustomerId();
         if (oneCustomerId != null) {