The invention discloses a stone polisher. The stone polisher comprises guide rails and at least one set of grinding device arranged on the guide rails, as well as worktables and control devices, which correspondingly work together with the grinding devices, wherein the worktables are positioned beside the guide rails; and each grinding device comprises a mounting base arranged on the guide rails in a sliding manner, a grinding head body connected with the mounting base and an automatic compensation device which enables the grinding head body to be in close contact with the surface of stone, and a grinding head body lifting device and a horizontal moving device are arranged on the mounting base. The stone polisher can enable grinding heads to move in three directions to be in all-directional contact with workpieces, so that all-directional multi-operation grinding of the workpieces can be realized. The stone polisher can perform grinding processing on both common cylindrical stone and specially-shaped stone, and therefore, has a wide application range.