Transmission shaft and spherical surface grinding polisher

The invention discloses a transmission shaft. The transmission shaft comprises a hollow main shaft, an installing part used for installing the hollow main shaft, a power wheel and a rotating connector device, wherein the power wheel and the rotating connector device are arranged on the hollow main shaft. The problem that it is difficult to add cooling liquid in a grinding tool and a workpiece is effectively solved, the cooling liquid can be effectively supplemented in time, and it is guaranteed that ground powder can be discharged in time. Meanwhile, the temperature of the grinding tool and the workpiece can be effectively reduced, and the temperature of the grinding tool and the workpiece is kept within the regulated range. The invention further provides a spherical surface grinding polisher with the transmission shaft. When the grinding polisher works, enough cooling liquid can be supplied to the machining face of the grinding tool and the workpiece through the transmission shaft in time, the powder generated in the grinding and polishing process can be discharged in time, and it is avoided that powder may damage the grinding face of the workpiece; and the temperature of the grinding tool and the workpiece is effectively reduced and controlled within the set range, and the grinding quality of the workpiece is guaranteed.