The invention discloses a glass thermal transfer foil and a preparation method thereof; the prepared glass thermal transfer foil is composed of a tape base and a thermal transfer layer coated on the tape base; and the thermal transfer layer is divided into three parts of which are a protection layer, a pattern layer and a connection layer in sequence from inner to outer at one side surface of thetape base. The product performance of the glass thermal transfer foil requires that the protection layer, the pattern layer and the connection layer are transfer-printed onto the surface of the glassproduct by special equipment under the technical conditions of proper temperature and pressure and the like, thus leading the surface of the glass product to not only have beautiful and clear exterior pattern but also have the characteristics of scraping resistance, wide temperature resistant range, and resistance of common solvents such as water, acid, alkali and the like, as well as good resistance of light and weather, and the like, and therefore, the invention have practical application value of protecting and decorating the surface of the glass product. The invention not only changes themonotony of the surface color of the glass product and gives people clear and vivid pattern aesthetic feeling, but also strengthens the protection function of the surface, thus being broadly used forthe decoration industry of the glass product.