▎ 摘　　要

NOVELTY - Preparing graphene composite fiber comprises adding graphite powder under stirring condition into an aqueous solution of concentrated sulfuric acid, stirring continuously, ultrasonically dispersing the mixture, filtering, washing with deionized water, separating the dispersion liquid to obtain graphene solution. USE - The method is useful for preparing graphene composite fiber (claimed). ADVANTAGE - The preparation method has simple process and is easy to popularize. The graphene composite fiber has high strength and large toughness.