Trimming and shaping device for mask machine

The trimming and shaping device for the mask machine comprises a machine body and supporting legs, a first limiting groove is fixedly formed in the surface of the top of the machine body, and a plurality of sets of first fastening openings are evenly formed in the surface of one side of the first limiting groove; supporting rods are fixedly mounted on the surfaces of the two sides of the top of the first limiting groove. By adopting the first fastening opening, the first limiting groove, the second fastening opening, the second limiting groove and the pulleys, in the using process, the clamping size of a mask can be adjusted by moving the concave groove to the different first fastening openings in the surface of the first limiting groove, and the stability of the mask in the moving process can be improved through the pulleys; the trimming device is simple in structure and convenient to operate subsequently, the cutting size can be adjusted by fixing a cutting knife to a second fastening opening in the surface