In screen printing, the hardness, flatness and tilt angle of the rubber scraper have a direct effect on the printing quality. During the printing process, the scraper is subjected to friction, and the sharp edge becomes dull and the blade edge is not straight. This machine is matched with the screen printing machine, used for grinding the edge of printing scraper, to ensure the straightness and inclination of the knife edge, and thus to ensure the accuracy of screen printing.