Floating seal torque measuring device under different pressures

The utility model belongs to the technical field of shield equipment, and provides a floating seal torque measuring device under different pressures, a support block is internally provided with an installation cavity, the installation cavity is internally provided with a bidirectional thrust bearing, the center of the bidirectional thrust bearing is provided with a main shaft which is in axial positioning fit with the bidirectional thrust bearing, and the main shaft is provided with a bearing. A cover cap which is provided with an upward opening and abuts against the main shaft is arranged below the main shaft, the outer wall of the cover cap is in threaded connection with the inner wall of the mounting cavity, a lower cavity is formed in the top face of the supporting block, a gland is arranged above the supporting block, an upper cavity is formed in the bottom face of the gland, and the upper cavity and the lower cavity form a space for containing a floating seal to be tested. An axial positioning mechanism