The invention belongs to the technical field of material science, and particularly discloses montmorillonite/graphene oxide composite nanosheet layer material modified epoxy resin anticorrosive paintas well as a preparation method and application thereof. The anticorrosive paint comprises a component A and a component B. The component A comprises epoxy resin, a montmorillonite/graphene oxide composite nanosheet layer material, nano silicon dioxide, nano titanium dioxide, mica powder, a wetting dispersant and a solvent, and the component B comprises a curing agent, an antifoaming agent, a leveling agent and a solvent, wherein the mass ratio of the component A to the component B is 100: (20-100). Through an ion exchange reaction, the composite nano-powder material formed by mutual intercalation of two two-dimensional lamellar materials of modified montmorillonite and graphene is prepared. Compared with montmorillonite and graphene oxide which are independently used, the montmorillonite/graphene oxide composite nanosheet layer material can provide better corrosion protection performance for the epoxy resin paint.