To resolve the implementation complexity and poor reliability problems for aircraft ground control equipment of Li-ion battery smart battery management system. This paper develop a simple structure, high reliability Li-ion battery smart battery management system based on the FPGA. The passive equilibrium control module of the smart battery management system can automatically deal with the problem of overcharge and overdischarge. And the module can provide accurate full charge stop sign also. The improved current integration method was used to measure SOC and the state of health for the battery was fully considered. After the test, SOC module of the smart battery management system can achieve professional battery management chip capacity measurement accuracy, balance management module can effectively prolong the life time of the battery, restrain the overcharge effectively.