Expansion type abrasive belt polishing wheel

The utility model discloses an expansion type abrasive belt polishing wheel. The polishing wheel is arranged on a rotating shaft through a compression nut and comprises an annular abrasive belt, four movable supporting members, a belt pulley frame, a conical sleeve and a compensation spring, wherein the four movable supporting members are combined to form a circle; the annular abrasive belt is arranged on the outer circumference of the circle through a rubber sleeve; the belt pulley frame is fixed in the four movable supporting members; the conical sleeve is embedded in a space which is formed by sleeving the four movable supporting members on the rotating shaft; and the compensation spring and a spacer are arranged between the conical sleeve and the compression nut in turn. Through expansion of the conical sleeve and by using pretightening force of the compensation spring, elongation of the abrasive belt in a working process is compensated, and the abrasive belt is driven through the rotating main shaft to r