A-DOA/CNTs materials were obtained by synergistic modification of carbon nanotubes (CNTs) with dopamine (DOA) in a weakly basic system by oxidative self-polymerization and γ-aminopropyltriethoxysilane (APTES) hydrolysis and condensation reaction. Polyurethane prepolymer with double bond and semi-blocked end was synthesized by isophorone diisocyanate (IPDI), polycarbonate polyol (PCDL), Dihydroxymethyl butyric acid (DMBA), pentaerythritol triacrylate (PETA). The A-DOA/CNTs modified FPUA composite emulsion was prepared by emulsion copolymerization of vinyl monomers such as organic fluorine and other residual isocyanate groups and covalent polycondensation and crosslinking of the modified CNTs surface active groups. The results are as follows: When the amount of A-DOA/CNTs is 0.75% and the amount of organic fluorine monomer is 12%, the thermal decomposition temperature of A-DOA/CNTs/FPUA composite film is 329?C when the thermal weight loss is 10%. Compared with the thermal decomposition temperature of PUA film, the thermal decomposition temperature of PUA film is 292?C, and 37?C is increased. At this time, the dynamic storage modulus of composite film at -55?C is the best value, and the glass transition temperature is 83?C, which significantly improves the thermal stability of the film. The water absorption of A-DOA/CNTs/FPUA film is 5.2%, the water contact angle is 103.1? , the tensile strength is 23.3 MPa, the elongation at break is 352%, and the comprehensive performance is the best.