The utility model discloses a stomach subtracts and holds backstop for sacculus, including check valve door, flat pipe and thin pipe. Have the gap intercommunication between injection port in the valve and the flat pipe, the end of flat pipe be a thin pipe, and the lateral wall of thin pipe is opened has a gap, and flat guan ke communicates with each other via this gap and the external world. Under certain pressure, the liquid that pours into into from the injection port or gaseously get into thin pipe through the flat pipe struts the gap of tubule and flows, sufficient when the certain degree when the sacculus, the flat pipe receives the extrusion, and the pipe wall tightly pastes together, intracapsular liquid of ball or gaseous unable the effusion to realize ending the reverse action.