Abstract: Aiming at the problem that the traditional hydraulic system of drilling feed speed regulation cannot meet the needs of energy saving and accurate feed regulation of drilling robot, the characteristics of existing typical feed speed regulating system were analyzed. A load-sensitive feed speed regulating system for drilling robot was designed, and a flow regulating closed loop of "pump-valve-load-pump" was constructed. The simulation model of load-sensitive feed speed regulating hydraulic system was established, and the simulation of the slope load, the alternating load and the constant load-slope control signal were carried out. In the simulation process, the motion speed of the cylinder was stable and the system had good load characteristics. Compared with the traditional feed speed regulating system, the results show that the load-sensitive feed speed regulating system has obvious advantages in transmission efficiency and control accuracy. The research results are helpful to solve the problems of hydraulic transmission efficiency and control accuracy of drilling robot, and can provide reference for the optimization of other drilling robot hydraulic systems.