The European-style energy storage inverter step-up unit temporarily stores solar/wind energy and other green energy in a battery system, and sends it out to a three-phase AC step-up transformer through an energy storage inverter when necessary. It effectively addresses the instability and periodicity issues of wind/solar energy. The unit consists of an energy storage inverter (PCS), busbar bridge, low-voltage room (communication + power distribution), dry-type transformer, high-voltage room (with vacuum circuit breakers), and the unit's outer shell.