Abstract: Due to semi-closed tubular structure and poor ventilation, automobile exhaust gas accumulates in the tunnel, resulting in serious air pollution. In this paper, firstly, a kind of CQDs@TNs composite photocatalyst with visible light response and efficient degradation of NO was prepared by loading carbon quantum dots (CQDs) on the surface of unidimensional TiO₂ nanotubes (TNs). Secondly, a super hydrophobic self-cleaning photocatalyst coating was prepared by spraying epoxy resin as the film matrix, introducing low surface energy components and using the above photocatalyst as the photo active component. The microstructure, chemical composition and optical properties of the composite photocatalyst were characterized by SEM, XRD, XPS, Brunauer-Emmett-Teller calculation (BET), PL and UV-Vis, and the NO photodegradation performance was investigated. The microstructure, self-cleaning property and durability of the coating were systematically studied by SEM-EDS, ash adhesion resistance test, UV aging test, water flushing test, sandpaper abrasion test, and the photodegradation property and cyclic degradation performance of NO were also studied. The results show that the coating has good self-cleaning performance and durability, the NO degradation rate reaches 42.9%. Due to its good cycle stability, the coating is expected to be applied to the degradation of NO in tunnels and other semi enclosed environments.