Preparation method of anion exchange membrane

The invention belongs to the technical field of preparation of new materials, and discloses a preparation method of an anion exchange membrane, which comprises the following specific steps: step S100, firstly, taking SEBS particle raw materials as main materials to react with trioxymethylene, trimethylchlorosilane and tin chloride to generate chloromethylated cmSEBS; step S200, dissolving the cmSEBS in xylene, and then placing the solution in a mold to volatilize and cast a film; and step S300, soaking the cmSEBS membrane in a solution containing an amine component for reaction, and cleaning to obtain the target AEM membrane. The invention creatively provides a strategy that for AEM with SEBS as a main chain, an easily-dissolved membrane precursor is firstly subjected to membrane casting, then the membrane is immersed in a solution through a corresponding reaction for reaction ionization, and finally a final membrane product is obtained. The problems that most ionized polymers with SEBS as a main chain are hi