In order to meet the management demand of charger in intelligent Substation, the management unit of the charger based on STM32 is designed. According to the analysis of functional requirements, the hardware architecture and software architecture are designed, the charger management unit is developed, and the system experimental platform is built. The experimental data show that it can realize the functions of information collection and parameter adjustment, local data display and key operation, remote monitoring two-way communication, logic control of charger and so on. The practical application shows that it can enable the staff to control the work of the charger in real time, improve the intelligent management of the system and meet the needs of practical application.