Preparation method of polyphenylene sulfide based strong acid ion exchange fiber with high exchange capacity

The invention discloses a preparation method of a polyphenylene sulfide based strong acid ion exchange fiber with a high exchange capacity. The preparation method comprises the following steps: with a polyphenylene sulfide fiber as a raw material, 1,4-benzyl bichloride as a cross-linking agent and benzyl chloride as a grafting agent, firstly, dissolving the cross-linking agent and the grafting agent in a solvent for mixing evenly, then adding the polyphenylene sulfide fiber, and adding catalysts for cross-linking and grating reaction, thus obtaining a cross-linked and grafted polyphenylene sulfide fiber after the reaction is ended; adding the product into the solvent for fully swelling, and adding a sulfonating agent for sulfonation reaction after swelling, thus finally obtaining the polyphenylene sulfide based strong acid ion exchange fiber with the high exchange capacity. Due to the adoption of the preparation method, the preparation process is simple, the operation is convenient, the production cost is low