The invention relate to an etching method of a glass mirror decorative pattern blank, which is characterized by comprise that following steps: a, lofting a design pattern of the decorative pattern on an aluminum plate, and proces the design pattern into a bushing by using a universal wire saw and a shaping file; B, cleaning glass plates, including brown glass, blue glass, green glass or colorless glass, and coating a thin layer of paraffin anticorrosion material on the surface; C, covering the leaked blank plate on the glass plate, and then carving the blank plate with a carving tool according to the decorative pattern; D, after carving is finished, using cleaning powder to wipe off the residual preservative on the blank plate; E, etching the cleaned carved glass plate with hydrofluoric acid; After F. After 24 hours, remove all anti-corrosion materials and clean the glass plate; G, manually plating silver or mechanically vacuum plating aluminum on the glass plate; H, after the primer is painted, a glass mirror product is obtained; Or remove the primer, leave the coating in the concave pattern, and set the blank part with colored silver flowers.