The invention discloses an energy storage ship which comprises a plurality of wind-driven generators, a plurality of solar generators, an emergency generator, an electric propelling and steering unit, an electricity load, an energy storage unit and a comprehensive energy management unit, wherein the energy storage unit is electrically connected with the wind-driven generators, the solar generators and the emergency generator through electricity input wires, and the energy storage unit is further electrically connected with the electric propelling and steering unit and the electricity load through electricity output wires; and the comprehensive energy management unit is electrically connected with the emergency generator and the energy storage unit. According to the energy storage ship, wind energy and solar energy are used for generating power, and the power is stored in energy storage liquid, the power stored in the energy storage liquid is transported to a land exchange station, and power generation and transmission of offshore wind energy and solar energy are achieved.