The utility model provides a constant voltage formula power dynamic distribution charging device belongs to the charging device field, the power supply box comprises a transformer, the transformer is once surveyed and is connected to the generating line, the transformer secondary side is connected to the module of charging of filling in the electric pile, the power output end of the module of charging is connected to and fills electric gun, charge to electric automobile through filling electric gun, be equipped with the power management system, the output of power management system monitoring transformer, it sets up the power adjustable power module of charging in the electric pile to fill, it can be according to storage battery car's the power needs output charging source that charges to make every fill electric pile, power management system Dynamics distributes each electric output power that fills who fills electric pile, fill electric pile's output in can the dynamic adjustment charging station, make the vehicle of the various power that charge all chargeable, can the exportable maximum power of transformer.