Punching device for carton

The utility model discloses a punching device for a carton, which belongs to the technical field of carton processing and comprises a supporting seat, two moving seats are connected onto the supporting seat, a top frame is connected onto the supporting seat, an electric telescopic rod is connected onto the top frame in a penetrating manner, and the bottom end of the electric telescopic rod is connected with a punching component. According to the punching device for the carton, by arranging an electric telescopic rod, a connecting base, a telescopic air cylinder, a top block, a piston frame, a piston plate, a vertical rod, a contact plate and a pressing rod, the telescopic air cylinder is shortened, meanwhile, the top block is stored in the connecting base, a cutter can punch the corresponding position of the carton, after punching is completed, the electric telescopic rod drives the connecting base to move upwards, and the pressing rod is separated from the contact plate; and gas in the piston frame is transf