A new sliding mode control method based on feedback linearization decoupling is introduced to solve the problem that the traditional control strategy cannot completely decouple permanent magnet synchronous motor (PMSM). Firstly, the PMSM control system is divided into two independent linear subsystems, namely the speed subsystem and the current subsystem, by using differential operation and feedback linearization principle. Secondly, considering the poor robustness of the system, a new sliding mode controller with terminal attractor model is proposed. Finally, the simulation results show that the control strategy combined with the above two methods can improve the control precision, rapidity and robustness of the system.