The invention discloses a deep sea floating type pumped storage wind power generation device and method. The wind power generation device comprises a wind power generator tower, a pumped storage device and a buoyancy device, wherein the pumped storage device comprises a wind power generator, a water turbine and a water suction pump, the buoyancy device is used for supporting the wind power generator tower and comprises a hollow sphere body, and the water turbine and the water suction pump are arranged on a spherical shell of the hollow sphere body, so that water is extracted from the hollow sphere body through power energy generated by the wind power generator in the power utilization slack hours for pumped storage, and in the power utilization rush hours, external seawater is pressed intothe hollow sphere body through the atmospheric pressure to drive the water turbine to generate power, so that the wind power generator and the water turbine simultaneously supply the power to a powergrid. According to the wind power generation device, the power supply quantity of wind power generation to the power grid in different periods can be adjusted, so that the utilization efficiency of the power energy is improved, the adaptability of wind power generation to the power grid is improved, and the wind power generation device is expected to be popularized in deep sea areas.