concern_set = models.Concern.objects.filter(user_id=1).values("concern_id")

querysets = models.Task.objects.none() # 创建一个空的对象

for concern_id in concern_set:
    # print(concern_id['concern_id'])
    qurey = models.Task.objects.filter(task_status=True,shops__user_id=concern_id[''])
     print(qurey)
    querysets = querysets | qurey

print(querysets",querysets)

输出：<QuerySet [<Task: 做啥类>,<Task: 测试用任务>,<Task: 上看到结局>,<Task: 安坐收UI文化>,<Task: 标题>,<Task: 最新>]>