▎ 摘　　要

NOVELTY - Preparing carbon nano-tube graphene composite fiber comprises (a) mixing alginate and/or alginic acid salt and aqueous graphene oxide solution to obtain mixed solution; (b) spinning the mixed solution, solidifying, washing and drying through a coagulation bath containing divalent transition metal ions to obtain a graphene oxide fiber containing divalent metal ions; and (c) carrying out in-situ growth of the carbon nanotubes by the chemical vapor deposition on the graphene oxide fibers containing divalent metal ions. USE - The method is useful for preparing carbon nano-tube graphene composite fiber. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for carbon nano-tube graphene composite fiber prepared as mentioned above.