Abstract: The transmission mechanism between the actuator and the actuator surface in the unmanned aerial vehicle actuator system is a multi-stage connecting rod, which has great flexibility and can generate mechanical flutter phenomenon. To eliminate the harm of flutter to the unmanned aerial vehicle actuator system, active disturbance rejection control is adopted. Active disturbance rejection control uses an extended state observer to obtain the total disturbance and eliminate the influence of flexibility on the system, approximating the system as a rigid body. The simulation verification results show that active disturbance rejection control can quickly track instructions and eliminate flutter caused by system flexibility.