The invention relates to a coordination control method of a large-scale energy storage device. A coordination controller is used for controlling the startup and the shutdown of bottom layer control units; the bottom layer control units are used for feeding back the fault and a running state to the coordination controller; the coordination controller is used for monitoring the state of a bottom layer module and the allowable maximum charging/discharging power of a storage battery; a power control unit is used for distributing the power rating to each bottom layer control unit according to the proportional distribution; in the off-grid operation, a power balance control manner capable of avoiding the circulation of an inverter is adopted; and the balance of the storage battery is performed in an automatic balancing manner in a system shutdown or standby state. The coordination control method has the benefits that the difficult problem of multi-objective coordination control of the large-scale energy storage device is solved, a basis is laid for the research and development, and the popularization of the large-scale energy storage device, and the theoretical significance and the engineering practical significance are very important.