In order to further optimize the design and key parameter setting of the hydraulic system of the precision leveling vehicle on the basis of the design and development of a newsystem, the hydraulic system schematic diagram of precision leveling vehicle is drawn, and the vibrating system, screw fabric system and leveling system are respectively modeled and simulated by AMESim software. The simulation results show that the vibration frequency is set as 30 Hz to ensure the performance of the system. Adding accumulator in the system can improve the stability and reliability of the system, reduce hydraulic impact, and extend the service life of hydraulic components. The diameter of damping hole affects the lifting speed of oil cylinder in leveling: as the diameter of damping hole increases, the lifting speed of oil cylinder also increases. In order to ensure the working quality of leveling, the lifting speed is within the standard range, and the damping hole A1 diameter is finally determined to be 0.9 mm.