▎ 摘　　要

NOVELTY - Preparing high thermal conductivity graphene/chopped carbon fiber composite material involves dispersing graphene and carbon fibers in polyamic acid N, N-dimethylacetamide solution, and vacuum-filtering or freely settling the graphene. The carbon fibers are freely stacked to form composite film material. The solvent is N, N-dimethylacetamide which is replaced by dipping with ethanol, and graphene/carbon fiber/polyamic acid composite material is obtained by supercritical drying. The graphene/carbon fiber/polyamic acid composite material obtained is placed into graphite mold, applied pressure and performed thermal amination at 300-400 degrees C to obtain graphene/carbon fiber/polyimide composite materials, maintains applied pressure, carbonized at 1000-1200 degrees C and graphitized at 2600-3000 degrees C in order to obtain graphene/carbon fiber thermally conductive composite material. USE - Method for preparing high thermal conductivity graphene/chopped carbon fiber composite material. ADVANTAGE - The method enables to prepare high thermal conductivity graphene/chopped carbon fiber composite material that improves high thermal performance in the thickness direction of material, overcomes shortcomings of poor thermal conductivity in thickness direction.