To enhance the mechanical properties and electrical conductivity of polyurethane UV-cured coatings，by the chemistry reaction for polyurethane，isophorone diisocyanate（IPDI） and hydroxyethyl methacrylate（HEMA）were employed to prepare the chemical graft graphene oxide，such as a novel HEMA-grafted graphene oxide（HEMA@GO）. The synergistic effect of HEMA@GO and multi-walled carbon nanotubes（MWCNTs）on the mechanical properties and electrical conductivity of the polyurethane UV-cured coatings was investigated. The results showed that the interlayer space of the functionalized GO expanded from 0. 89 nm of GO to 2. 10 nm，and both the dispersion and interfacial bonding between GO and the polyurethane matrixwere enhanced significantly. With an increase of carbon materials in content，the tensile strengthand hardness of the films increased initially and then declined. The optimum tensile strength of 13. 6 MPa and hardness of 6H were achieved with the mixture HEMA@GO and MWCNTs at 1.0% and 3.0%，respectively. Moreover，the synergistic effect of HEMA@GO and MWCNTsmade the square resistance of the polyurethane coating decrease significantly，decreasing it from 10¹² kΩ/□ for the unmodified sample to 7. 1 kΩ/□ . This results highlighted thesubstantial enhancement in both electrical conductivity and mechanical performance.