Device and method for polishing large part

A device for polishing a large part, comprising a rotary table (18) supporting a turbine part at a specified position, rotatably supported on a support member, and drivingly rotated by a drive motor, an abrasive material feed means feeding abrasive particles formed mainly of elastic bodies as an abrasive material to a specified position, a polishing head (6) drivingly rotated by an impeller drive motor (11) at a high speed, having an impeller (12) providing rotating energy to the abrasive particles fed from the abrasive material feed means, and jetting the abrasive particles flying out in the tangential direction of the impeller at a predetermined speed toward the polished surface of the turbine part held on the rotary table, and an abrasive material recovery means recovering the abrasive particles fed from the polishing head (6) thereto for the polishing of the turbine part and feeding the abrasive particles to the abrasive material feed means.