In order to improve the dynamic performance of permanent magnet synchronous motor (PMSM), a finite time control method based on current loop of PMSM was proposed. The method was as follows: traditional PI speed control strategy was adopted for the speed loop, and the finite time control strategy was adopted for the current loop. The MATLAB simulation results show that: compared with traditional double PI control strategy for current loop and speed loop, using the adjusted strategy based on finite time introducing the secondorder extended state observer, the negative impact of uncertain disturbance on the system is weakened, the dynamic performance of the system is better. It has advantages in fast tracking speed command, reducing speed overshoot and shortening system adjustment time.