Brackish water desalination equipment, suitable for high saline-alkali areas and seawater backfilling areas, the use of reverse osmosis membrane elements, high-quality pressure vessels, and high pressure pumps, with reasonable pretreatment equipment, can effectively remove the inorganic salts, heavy metal ions, organic matter, bacteria and bacteria and other harmful components in the water, the brackish water desalination into the national standard of drinking water quality water.