The invention discloses a wind power generation alternating current variable pitch servo driver output torque smooth control method. The method includes the following steps that: 1) the current acceleration a of a variable pitch motor is calculated according to an equation that a=domegar/dt; step 2) the current control mode of the variable pitch motor is judged, if the current control mode of the variable pitch motor is a speed control mode, the method shifts to step 3), if the current control mode of the variable pitch motor is a position control mode, the method shifts to step 5); step 3) whether the current operating state of the variable pitch motor needs output torque smooth control is judged; step 4) torque smooth control logic is provided, and a final target torque is outputted, and the method shifts to step 6); step 5) the angle change rate of blades is judged, when dlambdar/dt is larger than lambdas, Ttmp1 is made to be equal to T*em, and the method shifts to step 4); and 6) the step 1) is repeated. According to the wind power generation alternating current variable pitch servo driver output torque smooth control method of the invention, the speed of the variable pitch motor and the position states of the blades are identified, the torque smooth control method of the variable pitch motor is provided, and therefore, the impact of wind speed fluctuation on the variable pitch motor, the blades, gears and bearings can be avoided, the service lives of the components can be prolonged, the operating performance of the components is improved, and the economic efficiency of enterprises can be improved.