Mouth piece air collection bag for adults

The utility model relates to the technical field of gas collection bags, and discloses a mouthpiece gas collection bag for adults, which comprises a three-way mouthpiece, and the three-way mouthpiece is provided with a gas inlet, a gas collection bag connector and a waste gas bag connector; a connecting piece is arranged in the gas collecting bag connecting opening; the connecting piece is provided with a connecting pipe in the direction of the air collecting bag connecting opening. The gas collecting bag is provided with a one-way valve, and the one-way valve is detachably connected with the connecting pipe; the waste gas bag is provided with an opening, and the waste gas bag connector is sleeved with the opening; gas blown out of the device firstly enters the waste gas bag along the three-way mouthpiece, the air pressure in the waste gas bag is increased along with the entering of the gas, and after the air pressure is increased to a certain degree, the subsequently blown gas enters the gas collecting bag a