Polishing belt sander with good dust removal effect

The utility model discloses a polishing belt sander with a good dust removal effect, which comprises a mounting plate, a fixing frame, a driving motor, a driving rotating wheel, a driven rotating wheel, a servo electric cylinder and a polishing abrasive belt, a back plate is fixed on the back of the fixing frame through bolts, and one end of the back plate is connected with the fixing plate. Connecting columns are welded to the two sides of one end of the fixing plate, transverse air guide bins are connected to the ends of the connecting columns, a rotating shaft is arranged between the fixing plate and the transverse air guide bins through rotating grooves, the outer side of the rotating shaft is sleeved with a vertical air guide bin, one side of the end of the rotating shaft penetrates through the fixing plate, and a gear is arranged on the periphery of the rotating shaft. A protruding block is fixed to the outer side of the output end of the servo electric cylinder through a connecting screw. The device is