▎ 摘　　要

NOVELTY - The method involves mixing carbon fiber with coating film that is matched with a graphene composite heat-conducting film. Concentrated sulphuric acid and phosphoric acid are mixed in the graphene composite heat-conducting film. Temperature of mixed solution is about 40-60 degrees centigrade. Graphite oxide is mixed in ultrasonic dispersing oxidized graphite. A machinery stir part is contained with graphene oxide and the carbon fiber. A PET film is matched with a drying tank. Average length of the carbon fiber is about 10-20 mm. USE - Graphene composite heat-conducting film preparation method. ADVANTAGE - The method enables increasing tensile strength.