The high frequency injection sensorless control algorithm of permanent magnet synchronous motor（PMSM）is prone to lag when estimating motor angle, which affects the accuracy of speed control. To solve this problem, a sensorless control strategy of PMSM based on linear active disturbance rejection control is proposed. The speed closed-loop of PMSM is optimized by using simplified linear active disturbance rejection control algorithm. Simultaneously, a sensorless angle observation algorithm using high frequency sinusoidal voltage injection is used to obtain the angle and velocity information of the motor rotor. Finally, through simulation analysis and physical experiments, it was verified that the control strategy can effectively improve the estimation accuracy of motor angle and speed of PMSM, improve the control effect of the system, and have good prospect of engineering application.