The invention relates to the field of sea water desalination, specifically to a wind-electricity complementary hydraulic-driven sea water desalination apparatus. The apparatus comprises a sea water pressurization system, a wind-driven hydraulic pressurization system and a reverse osmosis sea water desalination facility. The wind-driven hydraulic pressurization system comprises an oil tank, a low pressure oil pump, an oil transporting pipe and a wind-driven hydraulic pressurization unit. The wind-driven hydraulic pressurization unit comprises a cabin, a wind turbine impeller, a main shaft of the impeller, an acceleration gearbox, a shaft coupler and a hydraulic pump, wherein the wind turbine impeller is arranged in the front of the cabin, the main shaft of the impeller, the acceleration gearbox, the shaft coupler and the hydraulic pump are arranged in the inner of the cabin, and are sequentially and fixedly connected. The wind-driven hydraulic pump is provided for generating high pressure oil. The hydraulic pressurization pump adopts the high pressure oil as the power to pressurize on the sea water to carry out reverse osmosis desalination of the sea water. In the environment of insufficient wind or no wind, an electric water pump can be started properly to pressurize to ensure the sea water desalination facility to work. The apparatus provided by the present invention is applicable for the reverse osmosis desalination of the sea water so as to reduce power consumption. In addition, the apparatus has advantages of investment saving, high efficiency and the like, and is especially applicable for a plurality of islands and coastal areas.