▎ 摘　　要

NOVELTY - Preparing three-dimensional network porous composite membrane comprises (i) dissolving poly-polyol in water, magnetically stirring to completely dissolve, adding graphene dispersion liquid, magnetically stirring to disperse uniformly, (ii) adding aldehyde high molecular compound with carboxy functional group, magnetically stirring to completely de-foaming, using pH regulator to adjust pH value of the system, adding aldehyde cross-linking agent, and moving to glass vessel for drying to obtain three-dimensional network porous composite membrane. USE - The method is useful for preparing three-dimensional network porous composite membrane in an ion selective membrane (claimed). ADVANTAGE - The method: enables to prepare three-dimensional network porous composite membrane by using simple casting membrane method; has high stability, low cost, high ion flux and ion selectivity; utilizes the poly-polyol as three-dimensional network frame; utilizes carboxy group-containing aldehyde group-containing polymer compound to provide carboxy group; and improves the ion selectivity.