The invention discloses a preparation method of a conductive anticorrosive coating of modified graphene. The method comprises the steps that firstly, polyaniline is grafted to the surface of modified graphene in a conjugate mode, and the polyaniline is used as conductive filler and then forms the conductive anticorrosive coating with epoxy resin. The component A is prepared from 10 g of epoxy resin, 1.0-2.5 g of modified graphene powder, 0.1-0.3 g of fumed silica anti-settling agent, 10-30 ml of a mixing solvent, 0.01-0.03 g of polydimethylsiloxane defoaming agent, 0.03-0.05 g of a flatting agent and 0.04-0.06 g of a sodium dodecyl benzene sulfonate dispersing agent. The component B is prepared from 3-10 g of a curing agent and 3-10 ml of a mixing solvent. The mixing solvent comprises xylene and normal butanol, and the volume ratio of xylene to normal butanol is 7:3. The modified graphene is used as the filler, the conductive anticorrosive capacity of the coating can be greatly improved, and the great potential application value is achieved on the earth screen conducive and anticorrosive aspects.