The invention discloses a position control method of a hydraulic servosystem, and relates to the technical field of hydraulic servo systems. The method comprises the steps of obtaining an application range of the hydraulic servosystem and marking the application range as an initial range; based on the initial range, determining a moving position range of the hydraulic servo system in the initial range and marking the moving position range as an initial search range; based on the initial search range, a final search range is obtained through calculation according to a final range correlation function, and the optimal movement position of the hydraulic servo is determined in the final search range and marked as an execution position; re-determining an execution position according to an execution correlation function based on the final search range; and controlling the hydraulic servo system to move to the execution position by utilizing the super-spiral sliding mode controller based on the execution position. The position control performance of the hydraulic servo system is improved.