In order to improve the stability and service life of the magnetic fluid bearing,the eddy current loss simulation model of the magnetic fluid bearing was established,the distributions of the magnetic field,temperature field and thermal deformation of the magnetic fluid bearing under the initial conditions were analyzed.Maxwell software was used to simulate and solve the eddy current loss generated by the bearing rotor.The influences of changes in input current,speed,and inlet oil flow rate on the eddy current loss and heat transfer rate of the magnetic sleeve were analyzed based on multi-field coupling,and the change of the rotor heat dissipation law was explored,and experimental verification was conducted.The experimental results show that with the increase of current and speed,the temperature difference between inlet and outlet increases gradually.The trend of the experimental value and the simulation value is consistent,and the error is within an acceptable range,which verifies the reliability of the simulation results.