NOVELTY - Electricity-water co-production method using a combination of solar power generation and sea water desalination, comprises e.g. converting solar radiation energy into heat energy of a heat carrier, transferring energy to a high-pressure steam and low-pressure steam in a high-pressure steam generator (3) and a low-pressure steam generator (7), converting part of the energy in the high-pressure steam into electric energy, injecting part of the steam into a low-temperature multi-effect distilling-desalting device, and then conveying to the first effect of the device to produce fresh water.    USE - The method is useful for electricity-water co-production using a combination of solar power generation and sea water desalination (claimed).    ADVANTAGE - The method utilizes the residual heat for desalting the sea water after the solar power generation to ensure high-efficiently utilization of solar radiation heat and reduce the temperature of the heat carrier returned to the heat collecting system, and thus improves the heat collection efficiency and achieves coproduction of electricity and water with high technical efficiency economic benefit.    DETAILED DESCRIPTION - Electricity-water co-production method using a combination of solar power generation and sea water desalination, comprises converting solar radiation energy into heat energy of a heat carrier by a solar heat collecting system (1), respectively transferring energy to a high-pressure steam and low-pressure steam via the heat carrier in a high-pressure steam generator (3) and a low-pressure steam generator (7), converting part of the energy in the high-pressure steam into electric energy via a steam generating system (2), expanding the low-pressure steam in a steam ejector (6), injecting part of the steam into a low-temperature multi-effect distilling-desalting device, then conveying to the first effect of the low-temperature multi-effect distilling-desalting device as driving heat source to produce fresh water, allowing the heat carrier to exchange heat in a steam generator, and boosting into the solar heat collecting system to absorb solar radiation energy via a heat carrier pump.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic representation of the system adopted by the method for electricity-water co-production.    Solar heat collecting system (1)    Steam generating system (2)    High-pressure steam generator (3)    Steam ejector (6)    Low-pressure steam generator (7)