NOVELTY - The method comprises providing a reverse osmosis seawater desalination system for performing desalting treatment, obtaining fresh water and concentrated seawater, performing potassium ion sieve treatment, extracting the potassium ion in the concentrated seawater, extracting the bromine in the concentrated seawater via an air blowout method, extracting the magnesium in the concentrated seawater via a precipitation method, extracting the salt in the concentrated seawater via an ion exchange method, obtaining refined salt and liquid salt, and conveying the saltwater to desalination system.    USE - The method is useful for desalinating sea water, which is useful for generating electricity.    ADVANTAGE - The method is capable of economically desalinating the seawater thus providing fresh potable water with high quality.    DETAILED DESCRIPTION - The method comprises providing a reverse osmosis seawater desalination system for performing desalting treatment, obtaining fresh water and concentrated seawater, performing potassium ion sieve treatment, extracting the potassium ion in the concentrated seawater, extracting the bromine in the concentrated seawater via an air blowout method, extracting the magnesium in the concentrated seawater via a precipitation method, extracting the salt in the concentrated seawater via an ion exchange method, obtaining refined salt and liquid salt, and conveying the saltwater to the reverse osmosis seawater desalination system. The reverse osmosis seawater desalination system is equipped with a wind generating machine. The desalting treatment comprises: taking the water from a sea water well via a submersible pump; conveying the sea water to a disc filter and then filtering; conveying the filtered sea water to a purifying pool; placing a pump in the purifying pool; adding an anti-sludging agent into the sea water; conveying the fresh water to a tank; and obtaining distilled water. The submersible pump is equipped with a wind energy generator set.    DESCRIPTION OF DRAWING(S) - The diagram shows a flow chart of a method for desalinating seawater (Drawing includes non-English language text).