The invention relates to the technical field of AC servo control systems, and provides an AC servo system speed loop parameter self-correction method based on prediction compensation. The method comprises the steps: S1, the AC servo system is processed, wherein processing comprises initialization and parameter setting; S2, the current and the speed of the processed AC servo system are extracted, and the parameters of a speed loop controlled model are identified in an online mode; S3, the error between the future estimated speed and the extracted actual speed serves as compensation, convergencelag existing in online identification of the controlled model is weakened, estimated speed output is obtained, and the estimated speed replaces the actual speed to serve as system feedback; and S4, the optimal control rate of the speed loop is solved according to the estimated speed, and two-degree-of-freedom PI control parameters are mapped. According to the method, automatic correction of the speed loop control parameters of the AC servo system under the condition of large-range change of inertia and external load disturbance is achieved, engineers do not need to manually set and adjust controller parameters, and the system automatically completes speed loop parameter self-correction.