The invention discloses a tank sealing head polisher. The tank sealing head polisher comprises a base, wherein a polishing main frame and a first motor are arranged at the upper end of the base; a rotating base is arranged at the upper end of the first motor; a sealing head clamping mechanism is arranged on the rotating base; the polishing main frame is provided with a rocker arm mechanism; a grinding head mechanism is arranged at the lower end of the rocker arm mechanism; the sealing head clamping mechanism comprises a clamping seat main body, a rocker, a guide track seat, a chuck, a secondary bevel gear, a main bevel gear, a main bevel gear shaft, a bearing and a main bevel gear fixing seat; the rocker comprises a handle and a screw; a limiting block which is used for limiting the position of the screw on the guide track seat is arranged between the handle and the screw; the chuck is arranged on the screw; the secondary bevel gear is arranged at the tail end of the screw; and the secondary bevel gear is engaged with the main bevel gear. The tank sealing head polisher is simple in structure and convenient to operate, and can be adjusted for sealing heads with different sizes; full-automatic polishing of the sealing heads is realized; the polishing effect is good; the efficiency is high; and a dust absorbing function is further fulfilled, so that the quality of the environment is improved.