In view of the low control accuracy of the feeding position of the automatic drilling rig,which affects the success rate of automatic make-up and unloading,and then affects the automatic construction smoothness of the automatic drilling rig， the dynamic simulation model of automatic drilling rig feed position servo system was established by AMESim,the parameter setting method of the model was introduced in detail,and the correctness of the model was verified by the simulation results.Then,the control variable method was used to simulate and analyze the influence of various components and parameters on the dynamic error of the feed position servo system,and according to the simulation results,comprehensive cost and implementation feasibility,the hydraulic and electronic control design parameters of the servo system were optimized to improve the control accuracy of automatic drilling rig feed position.Finally,a field test was carried out in Shigetai coal mine of Shendong Coal Group.The results show that the optimized automatic drilling rigs automatic make-up and unloading success rate increase from 92% to 98%,which greatly improves the automatic drilling rigs automatic construction smoothness.