Abstract: Aiming at the disadvantages of traditional disk-type permanent magnet magnetic coupler speed regulation, a magnetic coupler with variable area speed regulation is designed. Its working mode and speed regulation principle are analyzed in detail and the design idea is introduced. In order to study the feasibility of this new type of magnetic coupler, the method of combining finite element analysis and experimental verification is adopted. Firstly, the static magnetic field and transient field are analyzed by establishing a three-dimensional finite element physical model and using 3D finite element analysis., the simulation relationship curve between its coupling area and output torque is obtained. Finally, the test verification was carried out by manufacturing the prototype and building the test platform. The results show that the test data of the prototype are in good agreement with the simulation data, and the maximum relative error is only 3.52%, which verifies the feasibility and advanced nature of the speed regulation mode, increases the type and range of speed regulation modes, and provides a reference for the development of high-power variable area magnetic coupler.