Abstract:An introduction to the main functions and design principle of the hydraulic system for a automatic loading machine was presented. Based on analyzing the action and functions of the hydraulic system of the automatic loading machine, the design scheme of the hydraulic system was put forward and the circuit design process and hydraulic system working principle were introduced in detail. By practical test, the hydraulic system whose performance can meet the demand of automatic loading machine and work stably, has the good market application prospect.