A comprehensive performance evaluation method based on harmony search algorithm and fuzzy analytic hierarchy process was proposed for the problem that the comprehensive performance of AC servo system is difficult to be quantitatively evaluated. According to the control performance of AC servo system and the design of motor body of AC servo system, a fuzzy judgment matrix was constructed by using fuzzy analytic hierarchy process (FAHP). The problems of consistency checking and element value correction of the fuzzy judgment matrix were transformed into a nonlinear constraint problem, and the harmonic search algorithm was used to solve the problem and to obtain the weight value of the comprehensive performance index of the AC servo system. Then, the performance index values of different dimensions were normalized using fuzzy logic, and the comprehensive performance of AC servo system was quantitatively evaluated by weighting the normalized performance index values. Finally, MATLAB simulation was adopted to quantitatively evaluate the qualitative problems with a unified standard model. The results show that the proposed algorithm can be used to quantitatively evaluate the comprehensive performance of AC servo system.