At present, the problem of ensuring of arid and semiarid area with drinking water is of importance for different countries as the result of extension of both arid zones area and neediness in general extension of agricultural lands. In most regions the usage of natural sources of water is difficult due to high content of salt. At present, a number of technologies (partially, based on methods of electrodialysis) that enable to carry out demineralization with needed effectiveness is known well. However, absence of electro energy sources in thinly populated regions makes its usage problematical. In the work a new method of demineralization based on usage of polyelectrolyte hydrogels and wind energy is suggested. The method is based on two-stage usage of hydrogels. On the first stage hydrogels swell in processing water. As the result, only demineralized water enter into swelling hydrogel due to high density of ionogenic groups in the substance, and salts concentrate in a surrounding solution. On the second stage the separation of water from hydrogel is carrying out under influence of mechanical force, which is produced with the help of wind engine. In other words the advantage of the proposed method in compartment with already known is the direct usage of wind energy, without losses related with conversion into electrical one. In the work the construction of device, that enable to carry out demineralization in continuous regime and permitting transportation on a car is suggested. The device use hydrogels that are manufactured in industry in reversible regime. Expense of working substance makes 0.3-0.4 grams per ton of demineralized water. It is shown, that the using of proposed method only in the regions, directly adjoining to salty parts of Balkhash lake, could increase the agricultural lands more then 1 000 km2 on the first steps of the program.