Aiming at the problems of complex system, high hardware cost and low flexibility existing in the traditional test scheme of electric drive system, a parametric permanent magnet synchronous motor (PMSM) emulator is designed. The parametric model of PMSM is established. On this basis, the topology and control strategy of power electronic device of motor emulator are designed. The system simulation analysis is carried out on MATLAB/Simulink platform, which verifies the feasibility and effectiveness of using power electronic device to simulate the actual motor port characteristics under different working conditions and driver faults. This research lays a foundation for the application of motor emulator.