▎ 摘　　要

NOVELTY - Preparing graphene comprises (i) mixing mixed solution of crosslinking agent and surfactant with graphene oxide solution to obtain foaming solution, (ii) mixing foaming solution with reducing agent to obtain graphene hydrogel, and (iii) freezing and thawing the graphene hydrogel to obtain graphene. USE - The method is useful for preparing graphene. ADVANTAGE - The graphene has high compressive strength.