Tapping machine

The utility model relates to a tapping machine. The device comprises a base and a main board arranged on the upper surface of the base, a supporting plate is arranged on the base and located on one side of the main plate. A tapping assembly is arranged on the supporting plate in a lifting mode. The tapping assembly comprises a lifting plate and a driving motor arranged on the lifting plate; the output end of the driving motor is connected with a driving shaft; one end of the driving shaft is connected with a screw tap after penetrating through the lifting plate; a lifting driving assembly fordriving the lifting plate to lift is arranged on the base; a through hole is formed in the main plate in an up-down penetrating manner; a movable fastening assembly is arranged on the upper surface ofthe main plate; the movable fastening assembly comprises a first driving air cylinder and a second driving air cylinder which are arranged on the left side and the right side of the through hole correspondingly. Output ends o