Torque isolation device

The torque isolation device comprises a body, a plurality of opening grooves are formed in the body, supporting wheel mounting blocks are arranged in the opening grooves, and the two sides of each supporting wheel mounting block are connected with pressing blocks fixed to the bottom walls of the opening grooves through springs; a wheel cavity is formed in the supporting wheel mounting block, and the supporting wheel is connected into the wheel cavity through a pin shaft; a piston cavity is formed in the bottom of the open groove of the body, the piston cavity is communicated with the center cavity of the body, and a piston is arranged in the piston cavity. Pressure drop generated by pump starting and circulation pushes the piston to move upwards and pushes the supporting wheel mounting block to move upwards, so that the supporting wheel is engaged into the inner wall of a sleeve, isolation of lower-layer reaction torque is achieved, and devices such as a wellhead top drive are protected. The torque isolation