▎ 摘　　要

NOVELTY - Directly growing graphene thin porous separation membrane comprises: (i) coating a mixture of etching agent, high molecular polymer and solvent-A on a metal foil, calcining at high temperature under the oxygen-free condition, or coating a solution-B or dispersion-B of etching agent on the metal foil, then covering a layer of organic high molecular polymer film, calcining at 400-1200 degrees C for 10 minutes to 4 hours under oxygen-free condition; and (ii) removing the metal foil and reaction product to obtain ultra-thin porous graphene separating membrane. USE - The method is useful for directly growing graphene thin porous separation membrane (claimed). ADVANTAGE - The method is simple, economical, and does not require expensive devices. DETAILED DESCRIPTION - Directly growing graphene thin porous separation membrane comprises: (i) coating a mixture of etching agent, high molecular polymer and solvent-A (mass ratio of 1:0.5-50:100-1000) on a metal foil, calcining at high temperature under the oxygen-free condition, or coating a solution-B or dispersion-B of etching agent on the metal foil, then covering a layer of organic high molecular polymer film, calcining at high temperature under oxygen-free condition, where the mass ratio of etching agent, organic high molecular polymer and solvent-B is 1:0.5-50:100-1000; where calcinations is carried out at 400-1200 degrees C for 10 minutes to 4 hours; and (ii) removing the metal foil and reaction product to obtain ultra-thin porous graphene separating membrane, which is a single layer, double-layer or multilayer.