Punching machine with scrap accumulation preventing function

The utility model relates to the technical field of flowerpot drain hole machining, and particularly discloses a punching machine with a scrap accumulation preventing function, which comprises a conveying frame, a mounting frame, a blocking assembly, a lifting plate, a punching needle, a supporting piece, a scrap discharging plate, a first driving device, a second driving device, a third driving device and a supporting frame, the conveying frame is installed on the supporting frame and used for installing a conveying belt, the conveying frame is provided with a receding opening, the supporting piece is installed on the supporting frame in a vertically movable mode, the top of the supporting piece can protrude out of the conveying frame and can be contracted to the conveying frame through the receding opening, and the third driving device is used for driving the supporting piece to move vertically. The punching machine solves the problems that a punching machine in the prior art usually adopts a mode of direct