Due to the complex and nonlinear characteristics of the wind turbine, it is difficult to ensure the stability of the output power of the wind turbine by traditional PID pitch control. A Whale Algorithm optimized PID pitch controller is introduced. The Whale Algorithm is able to adjust PID parameters, and effectively solve the wind turbine’s nonlinearity problem. By comparing and analyzing the performance of the PID controller and the PID controller optimized based on the Whale Algorithm, the simulation results show that the latter can make the output power of the wind turbine quickly converge to the rated value, improve the dynamic response of the system, and precisely adjust the pitch angle.