［Objective］ Develop a novel waterborne epoxy composite coating to address theissues of low coating hardness and inadequate anti -corrosion performance caused by the introductionof hydrophilic groups.［Method］In this work，the hydrophilic segment Tween 20 was grafted onto epoxy resin（E-44）using isophorone diisocyanate to synthesize an emulsifier with a structure similar tothat of epoxy resin. The emulsification process parameters were optimized，determining that the mass ratio of emulsifier to epoxy resin was 1. 2∶1，the phase inversion temperature was 50 ℃，and the stirring rate was 800 r/min. On this basis，the impacts of adding graphene in different proportions on theshielding and corrosion resistance of the coating were further explored.［Results］The average particlesize of the prepared waterborne epoxy emulsion reached the nanometer scale. The coating film exhibited a hardness of 3H and an adhesion grade of 0，demonstrating excellent overall performance.Electrochemical tests indicated that the corrosion current density of the base waterborne epoxy coating was 1. 348×10^-6 A/cm². When the graphene content was 0. 8%，the coating exhibited optimal anti-corrosion performance，with the corrosion current density further decreasing to 1. 322×10^-8 A/cm².［Conclusion］The synthesized emulsifier had the main structural backbone similar to the epoxy resin， which effectively emulsified epoxy resin and improved the film hardness. The incorporation of an appropriate amount of graphene could significantly prevent water penetration，thereby endowingwaterborne epoxy composite coating with excellent anti-corrosion performance and promisingapplication prospects.