To realize the attitude control of a quadrotor aircraft with uncertain model in the presence of unknown external interferences,a robust adaptive controller based on the super twisting algorithm is proposed.This method combines the super twisting algorithm with robust adaptive control.The former is used to suppress the chattering phenomenon of the system,and the latter can effectively compensate for the uncertainty of the model,so that the anti-interference performance of the system can be enhanced.A Lyapunov function is constructed,and the stability of the closed-loop system is proved.In order to verify the designed controller,a simulation is conducted and a quadrotor platform is built for flight experiments.The simulation results show that the designed controller has faster convergence rate and stronger robustness,and the flight experiment verifies the feasibility of the proposed controller,which can realize stable control of the attitude of a quadrotor aircraft.