The invention discloses a torque transmission device. The torque transmission device comprises a shaft rod, lock nuts are arranged at both ends of the shaft rod correspondingly, and a spring, a first cam and a second cam are connected between the lock nuts in a sleeving mode; U-shaped clamping slots are formed in the wheel surface of the second cam, clamping holes are formed in the wheel surface of the first cam, abutting blocks are arranged in the clamping holes, and abutting springs are arranged between the abutting blocks and the end walls of the clamping holds; and position-locking rotating cylinders are arranged between the first cam and the shaft rod, position-locking slot holes communicating with the clamping holes are formed in the inner wall of the first cam, position-locking holes with surface openings are formed in the position-locking rotating cylinders, position-locking abutting rods are arranged in the position-locking holes, and position-locking springs are arranged between the position-locking abutting rods and the end walls of the position-locking holes. When the position-locking rotating cylinders rotate, under the action of the position-locking springs, the position-locking abutting rods stretch into the position-locking slot holes from the position-locking holes and abut between the abutting blocks and the abutting springs so as to enable the abutting blocks to be positioned. The torque transmission device is reasonable in structural design, convenient to operate, stable and reliable in use, high in applicability and good in practicability.