Pneumatic knocking device and actuating method thereof

The invention provides a pneumatic knocking device and an actuating method thereof, and the pneumatic knocking device comprises an air storage cavity which is provided with a first air inlet hole and a guide channel, and the first air inlet hole is located on the wall body of the air storage cavity and is connected with the guide channel; the actuating cavity is provided with a through hole, and the air storage cavity is communicated with the actuating cavity through a second air inlet hole; the movable plug body is provided with a plug body and an annular elastic side edge, the annular elastic side edge movably abuts against the wall face of the guide channel, the plug body is arranged between the first air inlet hole and the second air inlet hole, and the annular elastic side edge is gradually expanded from the first air inlet hole to the second air inlet hole; the movable knocking body is provided with a knocking body and a knocking head, the knocking body moves along the inner wall surface of the actuatin