Preparation method of high-shrinkage fiber

The invention provides a preparation method of high-shrinkage fiber. Graphene, a compatiblizing agent, and polyester master batches are blended and predispersed, and after the dispersed master batches and basic master batches are blended, spinning is performed; and the high-shrinkage polyester fiber which is good in properties is manufactured by a low-temperature drawing method. According to the preparation method disclosed by the invention, graphene materials are added, and a structure similar to a compound material namely an alloy fiber by utilizing the reticular structure of a sheet layer of the graphene and a PET macromolecular chain is formed; and besides, the compatiblizing agent including polyethylene grafted maleic anhydride or polyethylene-octene elastomer grafted maleic anhydride and the like is added, so that interfacial tension between the graphene and the dacron macromolecular chain is reduced, the compatibility of the graphene and the dacron macromolecular chain is improved, and the purpose of improving the mechanical properties of the polyester fiber is realized.