The whole machine frame adopts profile welding and manual aging treatment. The machine body is not deformed. The sanding machine runs more firmly, stable and reliable. The contact roller passes accurate dynamic balance detection, it can works smoothly and has good sanding performance. Frequency converter feeding, the fastest speed is 100m/min so that it can get high-efficiency production. The carrier roller under each contact roller is supported by spring float, it can be adjustable the back pressure of workpiece