▎ 摘　　要

NOVELTY - Preparing graphene-carbon composite fiber comprises (i) mixing graphene oxide, acrylonitrile monomer, itaconic acid monomer, solvent and polymerization initiator, ultrasonically performing in-situ polymerization, preparing carbon fiber precursor polyacrylonitrile polymer graphene-itaconic acid monomer to obtain composite spinning solution; (ii) defoaming composite spinning solution and spinning to obtain composite precursor; and (iii) pre-oxidizing composite precursor, carbonizing in a protective atmosphere. USE - The method is useful for preparing graphene-carbon composite fiber. ADVANTAGE - The fiber has excellent mechanical properties. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for graphene-carbon composite fiber, prepared as mentioned above.