▎ 摘　　要

NOVELTY - The method involves selecting a separating layer and a vacuum filter for preparation process. Deionized water is filled with a dispersing carboxylation carbon nano tube. Part of reducing graphene oxide is added with carbon nano tube dispersing liquid. Mixed dispersion liquid is formed on a porous support film and a flask for filtering process, where the filtering process is maintained in 0.1 to 10 hour. Composite nanofiltration membrane preparation process is performed, where temperature of the composite nanofiltration membrane preparation process is 40-100 degrees Celsius. USE - Graphene/carbon nano tube composite nanofiltration membrane preparation method. ADVANTAGE - The method enables realizing better anti-pollution performance, wide application range using a nano-filter, high desalting rate, simple and easy preparation process, strong controllability and low production cost. DETAILED DESCRIPTION - The porous supporting film is lead zirconate titanate/polyvinylidene fluoride ultrafiltration film. DESCRIPTION OF DRAWING(S) - The drawing shows a photograph of a graphene/carbon nano tube composite nanofiltration membrane.