The invention provides a constant voltage type power dynamic distribution charging device, and belongs to the charging device field; the constant voltage type power dynamic distribution charging device comprises a transformer; the transformer primary side is connected with a bus; the transformer secondary side is connected with a charging module in a charging pile; a power supply output end of the charging module is connected with a charging gun; the charging gun charges the electric vehicle; a power manage system can monitor the transformer output power; the power adjustable power supply charging module is arranged in the charging pile; each charging pile outputs the charging power supply according to the charging power needs of the charged vehicle; the power manage system dynamically distributes the charging output power of each charging pile, thus dynamically adjusting the output power of each charging pile in a charging station; vehicles of various charging powers can be all charged, thus utilizing the maximum power outputted by the transformer.