The chromium-polishing machine introduced from Switzerland realizes the digital control of the chromium-polishing quality of cylinder. Through inputting data, it changes the vibrating rate of polishing point and glib belt, pressure and moving speed to shape different veins. Comparing with traditional hand-polishing steady pressure, well-proportioned moving speed, regular polishing veins. Cell on the surface of cylinder after being polished are very smooth, proportionate and highly precise. Be able to eliminate thoroughly the phenomenon of sword line and ink marks etc. Improve the printing quality. The well-proportioned and smooth surface of cylinder can expand the life span of cylinder and scrapers.