Notching machine for degrading plastic bag

The utility model discloses a notching machine used for degrading plastic bags. The notching machine comprises a frame body, a conveying belt is arranged in the frame body, and a plurality of through grooves are formed in the conveying belt at equal intervals; first mounting plates are further fixed to the two sides of the middle of the frame body, and a movable cutting board further penetrates through the middles of the first mounting plates; the second mounting frame is arranged on the side wall of one side of the middle of the first mounting plate, and a thread transmission assembly is arranged between the inner wall of the second mounting frame and the cutting board; a mounting frame is further arranged on the outer wall of the second mounting frame. According to the utility model, the position of the cutting board is adjusted through the resetting action after the base metal is punched, namely, each punching of the punching die acts on different positions of the cutting board, so that the tool mark is no