Charging pile is the main equipment for electric vehicle charging, and its practicality is very important for electric vehicle users. The requirements of practicality mainly include: charging pile needs to take the step tariff for billing, can make the user according to their own needs to reasonably arrange the charging time; each part of the realization of the function needs to use modular design, convenient after the overhaul and maintenance: intelligent charging pile charging strategy is the most core part of the intelligent charging pile. Nowadays, the charging pile has long charging time and short battery life when charging iron phosphate batteries, and the charging strategy of intelligent charging pile needs to be able to solve such problems.