原因为data数据不是json类型，需要使用json.dumps(data)进行格式化，代码如下：

class UserBehavior(TaskSet):      @task(1)    def interface_1(self):        headers = {"Content-Type": "application/json"}        url = "/robat/cock/cock"        data = { 	    "taskid": "20180703101505551",	    "uinid": "29007037"        }        aaa = json.dumps(data)        self.client.post(url=url, data=aaa, headers=headers)