The invention belongs to an electric power feedback supply device for battery formation and a supply method for the electric power feedback supply device. The electric power feedback supply device for battery formation comprises a power transmission part and a control part, wherein the power transmission part comprises a public network and multiple groups of parallel circuits for battery formation, wherein a transmission port of the public network is connected with one end of each of multiple groups of parallel circuits for battery formation through a transformer and a rectifier; the other ends of the multiple groups of parallel circuits for battery formation are connected with a power supply inlet of a circuit control module; a power supply outlet of the circuit control module is connected with an energy storage battery pack and an inverter; the inverter is connected with the transmission port of the public network and a production system through a public network and production detection system respectively; the control part comprises the public network and production detection system and the circuit control module; and a signal transmission end of the public network and production detection system is connected with a receiving end of the circuit control module. The electric power feedback supply device for battery formation has the advantages of being reasonable in design, simple in structure and high in controllability, reduces energy consumption and reduces the manufacturing cost.