▎ 摘　　要

NOVELTY - Preparing graphene-based ultrathin composite membrane comprises (1) preparing graphene oxide solution, suction filtering by using AAO as substrate to obtain oxidized graphite alkene substrate film, (2) combining other materials on surface of oxidized graphite alkene substrate film to form ultrathin film; and (3) placing the AAO carrying the membrane structure on surface of water with surface of ultra-thin film facing up; pressing AAO causes AAO to sink, and obtaining graphene-based ultrathin membrane floating on water surface. USE - The method is useful for preparing graphene-based ultrathin composite membrane.