The high-power Lead acid battery charger is mainly used for on-board battery charging, such as battery-powered support carriers, forklift trucks, etc. , to improve the running efficiency of vehicles. In order to solve the problems of insufficient power capacity design of domestic explosion-proof Lead acid battery chargers, and the damage of power components and poor working reliability caused by the rise in the internal temperature of the explosion-proof case, a design proposal for a high-power explosion-proof Lead acid battery charger system is presented, which is based on the reasonable structural layout and power planning of the whole machine, and the adoption of a reasonable installation structure and assembly process, the reasonable electrical design scheme and component design selection, parameter matching, realize the whole machine hardware and software control parameter optimization, ensure the whole machine temperature rise does not exceed the standard under the high-power charging, and can work stably and reliably. The results show that this type of charger is easy to operate and repair, has high electrical safety performance, good man-machine interaction and perfect control and protection functions, and realizes the integration of various types of charger functions, the utility model solves the problems of low charging power, single input voltage, poor heat dissipation performance and low service life of the existing charger, and improves the service efficiency and service life of the charger.