▎ 摘　　要

NOVELTY - The preparation method of graphene aerogel involves adding reducing agent to graphene oxide solution and mixing, ultrasonically dispersing, performing reduction treatment to obtain graphene hydrogel, adding reducing agent to the graphene hydrogel, ultrasonically treating, carrying out final reduction treatment to obtain graphene hydrogel, dipping graphene hydrogel in aqueous solution of acid or alkali, washing the hydrogel to neutral, sucking the redundant liquid, freezing and drying. USE - The method is useful for preparing graphene aerogel, which is useful in electromagnetic wave absorption material (claimed). ADVANTAGE - The method enables simple, rapid and economical preparation of graphene aerogel with small density and excellent integrity, mechanical strength and electromagnetic wave absorbing property.