▎ 摘　　要

NOVELTY - Graphene material is having a fiber shape, where the diameter of the graphene material is 10 nanometer-20 micrometer, and length of the graphene material is 100 micrometer. USE - Graphene material used in the fields of textiles, coatings and plastics (claimed). ADVANTAGE - The graphene material expands the application range of the graphene material. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing a graphene material, which involves: (A) subjecting cellulose raw material to acid treatment to separate cellulose and hemicellulose, collecting solid to obtain a crude crude cellulose extract; (B) subjecting first crude cellulose extract obtained is subjected to alkali treatment to separate cellulose and lignin in the crude cellulose extract, and collecting solid to obtain a second crude cellulose extract; (C) heat-treating cellulose secondary crude extract and formic acid to further remove hemicellulose and lignin, and collecting solids to obtain a pure cellulose product, where the diameter of the pure cellulose product is 10 micrometer-20 micrometer; (D) subjecting pure cellulose product obtained to temperature-programming treatment in an inert gas environment to obtain a cellulose carbonized product; and (E) cooling graphitized cellulose carbonized product after being graphitized to obtain a graphene material having a fiber shape.