Abstract: In view of the requirements of large mining and high roadway construction projects in coal mine, the functions in lifting platform of mine car are put forward. The hydraulic system of WC10E (G) -45 in lifting platform is designed on the requirements, and the working principles of leg system, avoiding top system, lifting system and locking system are respectively introduced. The Hydraulic components are calculated according to the requirements and the type is selected correctly. Through the reasonable design of the hydraulic system circuit, the control performance of hydraulic system is optimized, the reliability of hydraulic system is improved and the safety of the construction workers is enhanced.