Reflecting coating of double-glass assembly and preparation method of reflecting coating

The invention provides a reflecting coating of a double-glass assembly. The reflecting coating comprises a high-content titanium dioxide layer on a bottom layer and a transparent glass glaze layer on an outer layer. The invention also provides a preparation method of the reflecting coating for the double-glass assembly. The preparation method comprises the following preparation steps: S1, preparing a basic glass glaze and a transparent glass glaze; S2, preparing bottom-layer slurry; S3, preparing outer-layer slurry; S4, conducting coating of a composite reflective coating; and S5, performing sintering. According to the composite reflecting coating, the outer layer completely wraps the bottom layer, the coating is firmly combined with embossed backboard glass, the compounded coating is high in adhesive force, higher in corrosion resistance compared with a common single reflecting coating, good in chemical stability, high in visible light average reflectivity, low in lipophilicity and small in ink consumption,