Aiming at the problem of low automation degree in the auto-leveling process of self-moving tractor chassis and body in hilly and mountainous areas, the structure of tractor chassis, the principle of control system, the configuration and arrangement of double-shaft inclination sensor and system pressure sensor were studied and the control strategy for the instability of hydraulic oil output in the leveling process of tractor chassis was summarized. The self-adjusting control system was designed and developed which included HMI（HC-SUK8070）, C470 controller,Codesys software control program, etc. In the process of auto leveling test, the response time of hydraulic system,sensor and electromagnetic proportional valve were tested. The test results indicated that the established automatic leveling system could monitor the parameters in the process of body leveling in real time and realize the operation of interlock, overload response, auto leveling of body and chassis, better improving the automation degree of the chassis-body leveling.