The invention relates to a solar energy multifunctional sea water desalination and power generation device, and it is characterized in that: multifunctional sea water desalination device comprises: box support, two-layer thermal insulation booth, heating device with solar energy, single-action sea water evaporator, sea water inlet, salt water inlet pipe, induced draft fan, steam cooling curtain, fresh water outlet pipe and fresh water collecting tank; solar pool comprises: two-layer thermal insulation booth, fresh water outlet pipe, fresh water collecting tank, salt water pool, salt pump and pool wall; solar power making device comprises: two-layer thermal insulation booth, box support, thermal insulation board, salt water outlet and inlet pipe, seawater outlet and inlet pipe, high pressure gas outlet valve, low pressure gas inlet pipe, high pressure gas outlet pipe, high pressure gas inlet valve, energy exchange device, refrigerant output valve, airturbine generator and air compressor. The said three parts form said seawater desalination and power generation device. The invention can not only use solar energy to make power and desalinate sea water, but also can get large amount of power and fresh with high quality and side product with high added value.