The adhesion and electrochemical properties of conventional heavy-duty anti-corrosion coating（conventional coating） and graphene heavy-duty anti-corrosion coating（graphene coating） were studied. The corrosion resistance of steel pipe piles in offshore wind farm protected by sacrificial anode and graphene coating was studied by numerical simulation method. The results show that the adhesion of graphene coating is significantly greater than that of conventional coating. The corrosion current density of graphene coating is reduced by one order of magnitude compared with that of conventional coating， and its corrosion potential rises， indicating that the anti-corrosion effect of graphene coating is better. Compared with the conventional coating， the use of graphene coating can significantly reduce the corrosion rate of steel pipe pile and improve the cathodic protection effect of the coating.