The present invention is provided with a water stop switch device (3), comprising: a main body (31), a transmission element (32) and a sealing element (33); the main body (31) is disposed with a water passage 834), the sealing element (33) is disposed in the water passage (34); one end of the sealing element (33) is coupled to the transmission element (32) in transmission way, the sealing element (33) moves in the water passage (34) to open the water passage; the other end of the sealing element (33) and the main body (31) surround to form a chamber (35); the side wall of the sealing element (33) is disposed with a through hole (331) connecting the water passage (34) and the chamber (35) ; when the water passage (34) is open, the chamber (35) is full of water to reduce the pressure difference at two ends of the sealing element (33). The present invention is provided with a water stop switch device, which needs smaller switch force to switch the water stop and water supplying state, the switch hand feel is well.