The invention discloses a metal hot stamping foil and a preparation method thereof; the prepared metal hot stamping 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 a protection layer, a pattern layer and a connection layer in sequence from inner to outer at one side surface of the tape base. The metal hot stamping foil prepared by the proposal has the product performance which requires that the protection layer, the pattern layer and the connection layer are transfer-printed on the surface of the metal product by special equipment under the technical conditions of proper temperature and pressure and the like, thus leading the surface thereof 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 metal products. The invention not only changes the monotony of the surface color of the metal products which gives people clear and vivid pattern aesthetic feeling, but also strengthens the protection function of the surface, thus being broadly used for the decoration industry of the metal products.