Two-in-one gradual change mirror and preparation method thereof

The invention discloses a two-in-one gradual change mirror, comprises a lens body, wherein a coating layer is arranged at the upper end of the lens body; the coating layer sequentially comprises a first membrane layer, a second membrane layer, a third membrane layer, a fourth membrane layer, a fifth membrane layer, a sixth membrane layer, a seventh membrane layer and an eighth membrane layer; thefirst membrane layer is an Al2O3 membrane layer; the second membrane layer is a Cr membrane layer; the third membrane layer is an H4 membrane layer; the fourth membrane layer is an SiO2 membrane layer; light is absorbed and reduced through the Cr membrane layer and the Ni membrane layer materials, and a gradual change effect is generated; the light is reduced and the reflection of the mirror surface is reduced through the Al2O3 membrane layer, H4, SiO2, SiO2 and SV-55 materials; two different gradual change effects can be realized by increasing the lens; through the arrangement of a double-gradual-change hole, the two gradual-change effects of soft gradual change and reverse gradual change are achieved on one lens, so that the two purposes are achieved on one lens, the purchasing cost is reduced, the number of the carrying lenses is reduced, the lens replacement frequency and the lens inserting frequency are reduced, and the working intensity of workers is reduced.