▎ 摘　　要

NOVELTY - Preparation of graphene oxide involves heat-treating a pitch-based carbon fiber, removing the impurities, treating with an acid solution, and performing chemical peeling method to produce a carbon material. USE - Preparation of graphene oxide used in composition for preparing epoxy-reinforced composite material (all claimed). ADVANTAGE - Graphene oxide can be prepared economically, and provides epoxy reinforced composite material having excellent mechanical properties. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) epoxy reinforced composite material composition comprising 0.01-0.1 pt. wt. graphene oxide with respect to 100 pts. wt. epoxy resin; and (2) preparation of epoxy-reinforced composite material.