diff --git a/yudao-module-member/yudao-module-member-api/src/main/java/cn/iocoder/yudao/module/member/enums/ErrorCodeConstants.java b/yudao-module-member/yudao-module-member-api/src/main/java/cn/iocoder/yudao/module/member/enums/ErrorCodeConstants.java
index e70e8bc1..7fb7c36c 100644
--- a/yudao-module-member/yudao-module-member-api/src/main/java/cn/iocoder/yudao/module/member/enums/ErrorCodeConstants.java
+++ b/yudao-module-member/yudao-module-member-api/src/main/java/cn/iocoder/yudao/module/member/enums/ErrorCodeConstants.java
@@ -148,6 +148,7 @@ public interface ErrorCodeConstants {
     ErrorCode STATISTICS_SPACE_CAPSULE_ORDER_NOT_EXISTS = new ErrorCode(1_004_021_001, "太空舱订单营业额统计不存在");
 
     ErrorCode INVOICE_INFORMATION_NOT_EXISTS = new ErrorCode(1_004_022_001, "用户发票信息不存在");
+    ErrorCode INVOICE_INFORMATION_NOT_TAX_EXISTS = new ErrorCode(1_004_022_005, "税号已存在");
 
     ErrorCode BILLING_NOT_COMPLETE = new ErrorCode(1_004_023_00, "还有金额未开票");
     ErrorCode BILLING_NOT_EXISTS = new ErrorCode(1_004_023_00, "开票记录不存在");
diff --git a/yudao-module-member/yudao-module-member-biz/src/main/java/cn/iocoder/yudao/module/member/service/invoiceinformation/InvoiceInformationServiceImpl.java b/yudao-module-member/yudao-module-member-biz/src/main/java/cn/iocoder/yudao/module/member/service/invoiceinformation/InvoiceInformationServiceImpl.java
index e85accf8..29ef0990 100644
--- a/yudao-module-member/yudao-module-member-biz/src/main/java/cn/iocoder/yudao/module/member/service/invoiceinformation/InvoiceInformationServiceImpl.java
+++ b/yudao-module-member/yudao-module-member-biz/src/main/java/cn/iocoder/yudao/module/member/service/invoiceinformation/InvoiceInformationServiceImpl.java
@@ -1,6 +1,8 @@
 package cn.iocoder.yudao.module.member.service.invoiceinformation;
 
+import cn.hutool.core.collection.CollUtil;
 import cn.iocoder.yudao.framework.common.pojo.PageResult;
+import cn.iocoder.yudao.framework.mybatis.core.query.LambdaQueryWrapperX;
 import cn.iocoder.yudao.module.member.controller.admin.invoiceinformation.vo.InvoiceInformationPageReqVO;
 import cn.iocoder.yudao.module.member.controller.admin.invoiceinformation.vo.InvoiceInformationSaveReqVO;
 import cn.iocoder.yudao.module.member.dal.dataobject.invoiceinformation.InvoiceInformationDO;
@@ -12,8 +14,11 @@ import org.springframework.validation.annotation.Validated;
 import cn.iocoder.yudao.framework.common.util.object.BeanUtils;
 
 
+import java.util.List;
+
 import static cn.iocoder.yudao.framework.common.exception.util.ServiceExceptionUtil.exception;
 import static cn.iocoder.yudao.module.member.enums.ErrorCodeConstants.INVOICE_INFORMATION_NOT_EXISTS;
+import static cn.iocoder.yudao.module.member.enums.ErrorCodeConstants.INVOICE_INFORMATION_NOT_TAX_EXISTS;
 
 /**
  * 用户发票信息 Service 实现类
@@ -29,6 +34,13 @@ public class InvoiceInformationServiceImpl implements InvoiceInformationService
 
     @Override
     public Long createInvoiceInformation(InvoiceInformationSaveReqVO createReqVO) {
+        String taxNum = createReqVO.getTaxNum();
+        List<InvoiceInformationDO> invoiceInformationDOS = invoiceInformationMapper
+                .selectList(new LambdaQueryWrapperX<InvoiceInformationDO>()
+                .eq(InvoiceInformationDO::getTaxNum, taxNum));
+        if(CollUtil.isNotEmpty(invoiceInformationDOS)){
+                throw  exception(INVOICE_INFORMATION_NOT_TAX_EXISTS);
+        }
         // 插入
         InvoiceInformationDO invoiceInformation = BeanUtils.toBean(createReqVO, InvoiceInformationDO.class);
         invoiceInformationMapper.insert(invoiceInformation);
@@ -40,6 +52,14 @@ public class InvoiceInformationServiceImpl implements InvoiceInformationService
     public void updateInvoiceInformation(InvoiceInformationSaveReqVO updateReqVO) {
         // 校验存在
         validateInvoiceInformationExists(updateReqVO.getId());
+        String taxNum = updateReqVO.getTaxNum();
+        List<InvoiceInformationDO> invoiceInformationDOS = invoiceInformationMapper
+                .selectList(new LambdaQueryWrapperX<InvoiceInformationDO>()
+                        .ne(InvoiceInformationDO::getId,updateReqVO.getId())
+                        .eq(InvoiceInformationDO::getTaxNum, taxNum));
+        if(CollUtil.isNotEmpty(invoiceInformationDOS)){
+            throw  exception(INVOICE_INFORMATION_NOT_TAX_EXISTS);
+        }
         // 更新
         InvoiceInformationDO updateObj = BeanUtils.toBean(updateReqVO, InvoiceInformationDO.class);
         invoiceInformationMapper.updateById(updateObj);