Universal power transmission mechanism of polishing machine

The utility model discloses a universal power transmission mechanism of a polishing machine, which comprises an upper disc fixing flange and a polishing disc, and a power rotating shaft is sleeved in the upper disc fixing flange through a bearing. One end of the power rotating shaft is in transmission connection with an external driving device, the other end of the power rotating shaft is in transmission connection with the polishing disc through a universal transmission structure, the universal transmission structure comprises a ball head and a transmission main body, and the bottom of the transmission main body is fixedly connected with the polishing disc; the ball head is located in the transmission body and is in running fit with the transmission body, the lower end of the power rotating shaft extends into the transmission body to be fixedly connected with the ball head, notches are symmetrically formed in the two sides of the inner wall of the transmission body, a pin shaft transversely penetrates throug