In order to improve the mechanical properties of steel pipe pile surface coating in the splash zone of offshore wind turbine, a graphene photosensitive composite reinforced fiber protective layer was designed. A numerical model was established to study the mechanical properties of graphene photosensitive composite reinforced fiber protective layer under impact load and temperature load. The mechanical properties of protective layer were compared when reinforced fiber resin composite tape and epoxy FRP were used as the middle layer respectively. The results show that the mechanical properties of reinforced fiber resin composite tape material are better than those of epoxy FRP, and a better impact resistance is observed; Under the same impact load, the shear force generated at the interface connected with the base steel for both materials are the same; The ability of reinforced fiber resin composite tape material to resist temperature stress is better than that of epoxy FRP. Under the action of cyclic temperature stress, epoxy FRP is more prone to damage and fall off.