Abstract: In view of the problem of strong fluctuation of control signal in the existing active disturbance rejection control algorithm for air speed regulation of mine local ventilator, which causes shock and vibration of frequency converter and motor, an improved active disturbance rejection control algorithm was proposed. The algorithm uses an improved method combining the arctangent function and the power function, the arctangent function enhances the linearity of control algorithm, ensures better smoothness at the origin of the function, and the power function guarantees the tracking speed of the control algorithm, and speed up the convergence of the control algorithm. The improved active disturbance rejection control algorithm is applied to the air speed regulation of mine local ventilator. The voltage signal processed by the control algorithm is used as the input signal of inverter of the local ventilator, and output frequency signal changes the speed of the asynchronous motor, so as to realize the dynamic adjustment of air speed of the local ventilator.The simulation results show that the improved active disturbance rejection control algorithm has obvious improvement in control speed and anti-interference ability compared with the existing PID control algorithm and active disturbance rejection control algorithm, which can adjust the air speed of local ventilator rapidly and stably.