Water desalination.

The method of desalting device, comprising is provided with the reverse osmosis device (15), when using, the reverse osmosis device is located in water, the secondary physical and chemical of the water body usual being is different from surface state, wherein the reverse osmosis device is provided with a reverse at one side inlet (17), when using, the inlet is arranged in the water on surface, wherein the reverse osmosis device is provided with the inverse-penetration at one side and to the outer concentrated liquid outlet (25), the concentrated liquid outlet which are located below the feeding pipe, to returned to the concentrated liquid discharge in the water, wherein the reverse osmosis device is provided withThe inverse-penetration the other one side penetrant outlet (27), the penetrant outlet and a feeding pipe is connected with the water, arranged on the pump is water body and reverse osmosis device (23), the pump for regarding the water on the reverse at one side.