Traditional doubly fed induction generator (DFIG) control had chattering phenomenon, which was easy to cause instability of the system. In order to reduce the chattering phenomenon of control and improve the stability of control, the mathematical model of DFIG was established on the basis of analyzing the dynamic characteristics of DFIG. The superhelix secondorder sliding mode controller was designed, and the control performance of the sliding mode controller in the case of sudden wind was studied. Simulation was carried out using MATLAB/Simulink. Simulation results showed that the sliding mode controller had good abilities of tracking optimal torque and adjusting reactive power. Compared with general control methods, it had strong robustness of rotor continuous voltage control. Furthermore, this sliding mode controller could significantly reduce the chattering and greatly improve the stability of the system.