A polisher with a dust suction function comprises: a frame (1); a polishing roller (2); a protection cover (3); a power device (4); a clamping mechanism; and a dust suction mechanism. A downwardly recessed accumulation cavity (5) is arranged at a surface of the frame (1). The protection cover (3) is an arc-shaped plate. The power device (4) is fixed to one side of the frame. An output shaft of the power device (4) extends toward an inner side of the frame (1) and passes through the clamping mechanism to connect to the polishing roller (2). The clamping mechanism comprises a supporting disc (6), a sliding disc (7), a clamping rod (8), a clamping block (9), and a supporting rod (10). The dust suction mechanism comprises an ion fan (13), an air admission tube (14), and an electrode needle (15). The air admission tubes (14) are installed downwardly and arranged uniformly at the top of the protection cover. The ion fan (13) is installed in the air admission tube (14). The electrode needle (15) is installed in the air admission tube (14) by means of a mount (16), and is positioned under the ion fan (13). The polisher with a dust suction function has a simple structure, and can be manufactured easily. Moreover, the invention can effectively collect dust while performing high efficiency polishing, thereby eliminating a subsequent cleaning operation, and improving operation efficiency.