Although the doubly-fed wind power generation system operates below the rated wind speed, the maximum output and stable operation need to be maintained. In order to realize this goal, a control mode of current inner loop and active disturbance rejection control (ADRC) speed outer loop is proposed, which makes the current and speed of doubly-fed induction generator (DFIG) quickly respond to the wind speed changes and conduct maximum power tracking. Simulation results show that ADRC has excellent anti-interference performance and adaptability, and can realize maximum power tracking of wind power generation system.