The invention discloses a semi-automatic piano hammer polishing device capable of conveniently fixing a piano hammer. The semi-automatic piano hammer polishing device comprises a base, a support and ascrew. A dust collection hole is formed in the upper end face of the base. The support is mounted on the edge of the top of the base. A suspension groove is formed in the inner side of the support. Asupporting rod is mounted in the suspension groove. An adjustment rod is connected into the supporting rod. A steering groove is reserved in the bottom of the adjustment rod. A fixing block is connected to the bottom of the connecting rod, and a mounting groove is formed in one side of the fixing block. The screw is arranged on the edge of the fixing block. A rubber pad is connected to a clampingblock. Both the clamping block and the rubber pad are arranged in the mounting groove. According to the semi-automatic piano hammer polishing device capable of conveniently fixing the piano hammer, the piano hammer is fixed in the mounting groove through the screw, the clamping block and the rubber pad, the supporting rod can slide horizontally in the suspension groove while realizing an overallsupporting function, and the piano hammer can be adjusted to be polished at multiple angles through the rotation of a steering ball in the steering groove.