▎ 摘　　要

NOVELTY - A carbon fiber composite material comprises carbon fiber, epoxy resin substrate material, and micro-nano material in which micro-nano material is graphene oxide surface-modified with magnetic nanoparticles. USE - A carbon fiber composite material (claimed). ADVANTAGE - Carbon fiber composite material has high cutting performance. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of carbon fiber composite material which involves dispersing graphene oxide surface-modified with magnetic nanoparticles in ethanol to form 0.01-20 g/L solution, performing ultrasonic treatment at 300-1000 W for 0.5-5 hours, adding epoxy resin to concentration of 200 g/L, stirring for 5-30 minutes, performing ultrasonic treatment at 300-1000 W for 0.5-5 hours, baking at 50-80 degrees C for 10-48 hours, extracting ethanol with vacuum pump, adding curing agent, magnetically stirring at room temperature for 20 minutes, extracting with bubbles with vacuum pump, performing vacuum-assisted resin transfer molding with carbon fiber, applying magnetic field using permanent magnet or electromagnet to orient graphene oxide, and curing.