The invention discloses a torque transmission device. The torque transmission device comprises an operation ring, a toothed ring and locking pieces. The operation ring can rotate around a central axis. The toothed ring can also rotate around the central axis. The locking pieces can move in the radial direction of the central axis. The toothed ring is provided with inner teeth and outer teeth. The inner teeth are arranged on the inner circumference of the toothed ring, and the outer teeth are arranged on the outer circumference of the toothed ring. The locking pieces are provided with locking teeth and locking blocks which are oppositely arranged in the radial direction of the central axis. The operation ring is provided with compression parts and release parts. The compression parts can compress the locking pieces to make the locking teeth be matched with the outer teeth, and the release parts can contain the locking blocks of the locking pieces to make the locking teeth be disengaged from the matching of the outer teeth. The locking pieces are arranged between the operation ring and the toothed ring in the radial direction of the central axis. The locking teeth of the locking pieces are located by the side of the toothed ring, and the locking blocks of the locking pieces are located by the side of the operation ring. The compression parts and the release parts are arranged at different circumferential positions of the operation ring in the circumferential direction of the central axis. The torque transmission device can achieve high-low speed switching.