Multi-functional reflective film of on-board exterior mirror and preparation method

The invention discloses a multi-functional reflective film of on-board exterior mirror and the preparation method. The reflective film comprises glass substrates piled in sequence, the first high refractive layer, the first low refractive layer, the second high refractive layer, the second low refractive layer, metal material layer, the third low refractive layer and conducting layer. The first high refractive layer and second high refractive layer are made from Ta2O5, TiO2 and Nb2O5, the first low refractive layer, the second low refractive layer and the third low refractive layer are made from MgF2, SiOxNy and SiO2, the metal material is made from Al and Ag, and the conducting layer is made from ITO and graphene. Inorganic material and conductive material are mixed reasonably. Vacuum magnetron sputtering deposition is used to produce adjustable reflective film used for on-board exterior mirror. Based on this, the film is connected with the heating system through the conductive coating. The mirror will be clean even in the Frost and snow weather, providing safety guarantee during driving.