The invention discloses a fluorinated graphene modified water-based anticorrosive coating and a preparation method thereof. The fluorinated graphene modified water-based anticorrosive coating comprises the following components in percentages by weight: 50-90 wt% of water-based epoxy resin, 0.1-1 wt% of a solid filler, 0.01-0.1 wt% of a thickening agent, 0.01-0.1 wt% of a leveling agent and 9.88-48.8 wt% of a curing agent, wherein the solid filler comprises fluorinated graphene modified by an ionic liquid. The invention provides an anticorrosive coating layer formed by the fluorinated graphenemodified water-based anticorrosive coating. The corrosion resistance of the coating layer provided by the invention is far better than that of a pure water-based epoxy coating layer under the condition of NaCl solutions with different concentrations, the adding amount of the required solid filler is very small, resources are effectively saved, and meanwhile the preparation process is simple, economical, practical and suitable for industrial promotion.