▎ 摘　　要

NOVELTY - A graphene oxide nanofiltration composite membrane preparing method involves pretreating the porous base film to remove organic substances, inorganic substances and microorganisms on the surface, dispersing the graphene oxide powder in deionized water and configuring the graphene oxide dispersion by ultrasonic centrifugation, assembling graphene oxide onto the surface of the porous base film by suction filtration to prepare a wet graphene oxide composite film, ice crystallizing the water in graphene oxide composite film under low temperature conditions and performing reduced pressure sublimation drying to obtain the finished product. USE - Method for preparing graphene oxide nanofiltration composite membrane. ADVANTAGE - The method enables preparing graphene oxide nanofiltration composite membrane with better separating property and stability.