Synthesizing method of 2-aminoethanesulfinic acid

The invention discloses a synthesizing method of 2-aminoethanesulfinic acid; the method comprises the following step of performing a nucleophilic substitution reaction on ethanolamine sulfate and hydrosulfite under the protection of gas, obtaining 2-aminoethanesulfinic acid. With the adoption of the method provided by the invention, the synthesizing method of 2-aminoethanesulfinic acid with an ideal yield can be obtained under a simple technological condition.