diff --git a/yudao-module-bpm/yudao-module-bpm-biz/src/main/java/cn/iocoder/yudao/module/bpm/controller/admin/task/BpmProcessInstanceController.java b/yudao-module-bpm/yudao-module-bpm-biz/src/main/java/cn/iocoder/yudao/module/bpm/controller/admin/task/BpmProcessInstanceController.java
index 128b354533..b5bb499c3b 100644
--- a/yudao-module-bpm/yudao-module-bpm-biz/src/main/java/cn/iocoder/yudao/module/bpm/controller/admin/task/BpmProcessInstanceController.java
+++ b/yudao-module-bpm/yudao-module-bpm-biz/src/main/java/cn/iocoder/yudao/module/bpm/controller/admin/task/BpmProcessInstanceController.java
@@ -167,10 +167,9 @@ public class BpmProcessInstanceController {
     @SuppressWarnings("unchecked")
     public CommonResult<BpmApprovalDetailRespVO> getApprovalDetail(@Valid BpmApprovalDetailReqVO reqVO) {
         if (StrUtil.isNotEmpty(reqVO.getProcessVariablesStr())) {
-            String processVariablesStr = reqVO.getProcessVariablesStr()
-                    .replace("\\\"", "\"")
-                    .replaceAll("^\"|\"$", "");
-            reqVO.setProcessVariables(JsonUtils.parseObject(processVariablesStr, Map.class));
+            // 二次JSON反序列化
+            String rawJsonString = JsonUtils.parseObject(reqVO.getProcessVariablesStr(), String.class);
+            reqVO.setProcessVariables(JsonUtils.parseObject(rawJsonString, Map.class));
         }
         return success(processInstanceService.getApprovalDetail(getLoginUserId(), reqVO));
     }