Aiming at the problem that the permanent magnet coupler produces a large amount of heat on the copper plate side of the conductor during operation and the device cannot work normally, a structure that can effectively improve the heat dissipation capacity of the conductor copper plate is proposed. First, based on the fluid-solid coupling mathematical model and the theoretical equations of heat transfer, the temperature distribution of the conductor copper plate of the permanent magnet coupler under different slips and different air gap lengths is calculated through finite element simulation, and the simulation results are compared with the experimental test results. The comparison verifies the accuracy of the simulation calculation method. Second, in view of the problem that the temperature of the conductor copper plate is too high and the heat cannot be dissipated, a structure with air guide heat sink added to the outside of the end cover is proposed, and the influence of heat sinks of different shapes on the heat dissipation effect is simulated and analyzed. Finally, the influences of the height, thickness and quantity of the air guide heat sinks on the temperature rise of the conductor copper plate are analyzed, and the optimal ranges of the design parameters of the air guide heat sink are obtained, providing scientific basis for the design of the air cooling heat dissipation structure of the permanent magnet coupler.