Hydraulic servomotor is a common energy saving hydraulic power component, capable of switching between pump and motor operating conditions. Precise displacement control of hydraulic servomotors is crucial for minimizing throttling losses and improving overall efficiency. However, the accuracy of hydraulic servomotor displacement control is adversely affected by high-frequency uncertainty disturbances in swashplate moment, traditional adaptive robust control did not account for this factor, leading to suboptimal displacement control effectiveness.