Machine tool spindle locking device

The utility model discloses a machine tool spindle locking device which comprises a base, the left end and the right end of the base are each fixedly connected with two mounting plates, the two mounting plates are symmetrically distributed front and back, a groove is formed in the right end of the base, the right portion of the upper groove wall of the groove is fixedly connected with a driving device, and the right portion of the upper groove wall of the groove is fixedly connected with a locking device. Main body devices are fixedly connected to the middle of the upper end of the base and the middle of the lower end of the driving device, fixing bolts are in threaded connection with the four corners of the upper ends and the four corners of the lower ends of the two main body devices, and three limiting rods are fixedly connected to the left portion and the right portion of the upper end of the base. The upper ends of the three limiting rods are fixedly connected with first limiting discs. According to the