The invention belongs to the field of optical thin films, and specifically relates to a heat insulation and ultraviolet resistance automobile pasting film used for automobile window glass, and a preparation method thereof. The automobile pasting film includes a first reflecting layer, a second reflecting layer, a third reflecting layer, a fourth reflecting layer and a fifth reflecting layer whichare successively superimposed; the first reflecting layer is an Al thin film or a CaCO3 thin film; the second and fourth reflecting layers are PET thin films; and the third and fifth reflecting layersare the thin films with the same materials which are selected from one of a Si3N4 thin film and an ITO thin film. The automobile pasting film is prepared by a magnetron sputtering method; and the prepared automobile pasting film can achieve high reflection effects on ultraviolet light and infrared light in sunshine, and can also achieve permeability enhancing effects on visible light, so that thepurpose of automobile pasting film heat insulation and interior decorative part protection can be achieved.