Air cylinder lifting locking device for oral cavity positive pressure film pressing equipment

The utility model provides an air cylinder lifting locking device for oral cavity positive pressure film pressing equipment. The air cylinder lifting locking device comprises a tray and a pressing plate installed above the tray. Supporting legs are movably connected to the sides, away from the pressing plate, of the trays, supporting pieces are movably connected to the sides, close to the trays, of the supporting legs, compression springs are installed on the sides, close to the trays, of the supporting pieces, and the other ends of the compression springs are fixed to the trays; the side, away from the tray, of the supporting piece is connected with an air cylinder, one end of the air cylinder penetrates through and is connected with a guide supporting plate, containing grooves for containing the supporting legs are formed in the guide supporting plate, and locking holes matched with the supporting legs are further formed in the guide supporting plate. According to the utility model, the purpose of preventin