▎ 摘　　要

NOVELTY - A graphene oxide composite nanofiltration membrane preparing method involves preparing graphene oxide dispersion liquid by utilizing an improved Hummers method is dropped on one side of the base film, uniformly coating with a coating rod, drying and partially reducing to obtain the finished product. USE - Method for preparing graphene oxide composite nanofiltration membrane. ADVANTAGE - The method enables preparing graphene oxide composite nanofiltration membrane with strong adjustability, non pollution, in simple and easy method, and cost effective manner. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a graphene oxide composite nanofiltration membrane prepared by the method.