Robot drive mechanism

The invention relates to the field of mechanical equipment, and particularly discloses a manipulator transmission mechanism with excellent using performance. The manipulator transmission mechanism comprises a sliding rail provided with a base seat. The base seat is horizontally provided with a first screw sleeved with a first nut. The base seat is provided with a post, and a second screw and a second nut which match mutually are arranged in the post. The second nut is provided with a rack. The post is provided with a rotary shaft perpendicularly, one end of the rotary shaft is provided with a gear matching with the rack, and the other end of the rotary shaft is fixedly provided with a telescopic base. The telescopic base is provided with a telescopic arm and a third screw sleeved with a third nut fixedly connected to the telescopic arm. According to the manipulator transmission mechanism, a manipulator can move transversely and the telescopic arm can telescope freely and stop freely in the travel range through the screw-nut transmission mechanism easily and conveniently, and meanwhile, the rotary shaft can rotate freely through the structure of the gear and the rack.