Rectum tissue bag

The utility model discloses a rectum tissue bag which comprises a bag body and a locking piece, the bag body is provided with an elastic piece in the extending direction so as to generate elastic deformation when the bag body shrinks in the extending direction, and the locking piece is used for locking the shrunk bag body and locking the shrunk bag body when the locking piece is unlocked. And the elastic sheet can restore deformation so that the bag body can be unfolded in the extending direction. According to the rectum tissue bag, the opening portion of the bag body faces the rectum anus end, then the locking piece is loosened, at the moment, the bag body is pushed to be unfolded in the process that the elastic piece recovers elastic deformation, the position of the tail of the bag body and the position of the rectum anus end are kept relatively stable or fixed in the unfolding process, and then the elastic piece can push the bag body to be unfolded on the rectum; the device can be automatically unfolded on