▎ 摘　　要

NOVELTY - Preparing composite material comprises (i) taking graphene oxide and dissolving in solvent to obtain graphene oxide solution, (ii) taking benzoxazine and epoxy resin and dissolving in solvent to obtain benzoxazine-epoxy resin solution, (iii) adding graphene oxide solution, stirring and uniformly dispersing to obtain benzoxazine/epoxy resin/graphene oxide mixture, (iv) drying to obtain benzoxazine/epoxy resin/graphene oxide intermediate, and (v) curing. USE - The method is useful for preparing composite material (claimed). ADVANTAGE - The method reduces curing temperature and increases toughness. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for benzoxazine/epoxy resin/graphene oxide composite material comprising benzoxazine, epoxy resin and graphene oxide in a mass ratio of 100:20-200:0.001-3.