Abstract: The multi-field coupling analysis of a magnetic coupling was numerically simulated to investigate the change rule of its temperature rise, stress and deformation at different rotating speeds based on the ANSYS Workbench coupling platform. Firstly, the unidirectional thermal magnetic coupling was carried out, and the temperature distribution was analyzed. Then the structure field of magnetic coupling under the combined action of magnetic field and flow field was analyzed by thermos setting unidirectional coupling. The results show that the high-temperature region of the isolation sleeve mainly corresponds to the location of magnetic steel in the axial direction, and the temperature decrease signi-ficantly to the both ends of the sleeve. The larger deformation area of the isolation sleeve is consistent with the high-temperature region, and it expands outward in the circumferential direction and decreases at both ends in the axial direction. For the internal magnetic rotor, the stress is mainly concentrated on the surface of the thin metal envelope and decreases toward the inside of the rotor. For the external magnetic rotor, the stress is mainly concentrated near the magnetic steel and the inner surface of the rotor, and the stress decreases from inside to outside. In addition, the deformation of internal and external magnetic rotor is smaller. The rotational speed has a significant influence on the temperature rise, and stress deformation of coupling components. With the increase of the rotating speed, the maximum temperature rises, stress and deformation value of the isolation sleeve increase by about 7 times, and the peak stress of the internal and external magnetic rotor increases from 6.350 MPa to 37.300 MPa.