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In view of problem that power coefficient must keep maximum value when wind power system is in underpower stage, based on the maximum wind power tracking in under power stage as the research key, analysed the theory on the process of wind turbine to capture wind energy. The paper proposed a control stategy of maximum wind power tracking based on ant colony optimization of self-tuning PID, used global optimization capability of ant colony algorithm to optimize three parameters of PID. The basic idea of the algorithm and the specific implementation steps was given and self-tuning PID controller based on ant colony algorithm was designed. Build the system simulation diagram to do corresponding simulation analysis. The simulation results shows that the proposed control strategy made the control system has good dynamic performance, improved control accuracy, wind energy utilization rate and output power. Which realized optimal running of wind turbines.