The invention discloses anti-corrosion graphene coating and a preparation method thereof. The preparation method includes the steps of S1, adding dispersed graphene, a reactive diluent, a coupling agent and a dispersing agent; S2, adding epoxy resin, a curing agent, zinc powder, filler and auxiliaries while stirring; S3, using a mechanical stirrer to perform stirring, and adding zirconium beads toperform grinding; S4, sufficiently mixing the resin and the curing agent, regulating viscosity, and spraying. The anti-corrosion graphene coating proportionally comprises the graphene, the reactive diluent, the dispersing agent, the epoxy resin, the curing agent, the zinc powder, the filler, the auxiliaries and the coupling agent. The preparation method has the advantages that the method is simple in process, and the prepared anti-corrosion graphene coating is high in thermal conductivity and viscous force, stable in performance and low in price.