The invention belongs to the technical field of building ceramic production, and particularly relates to a method for producing split-phase furnace transmutation decorative composite materials from red mud by roller kilns. The method includes placing raw materials, which include the red mud, feldspar, vanadium and titanium slag, quartz, borax, lepidolite and talc, in frit furnaces, melting the rawmaterials at the temperatures of 1400-1500 DEG C, then carrying out water quenching and crushing, carrying out sieving to obtain sieve residues and mixing the sieve residues with one another to obtain split-phase furnace transmutation raw materials; placing raw materials, which include feldspar, clay, flint clay, pyrophyllite and aragonite, in ball mills, carrying out ball milling for 36 h, thencarrying out spray granulation, placing granules in dies and carrying out compression molding to obtain green bodies; arranging the obtained split-phase furnace transmutation raw materials on the green bodies and drying and firing the green bodies with the split-phase furnace transmutation raw materials by the roller kilns to obtain the split-phase furnace transmutation decorative composite materials. The method has the advantages that all the requirements on the usability and the decorativeness of the traditional ceramic can be met by the split-phase furnace transmutation decorative compositematerials produced by the aid of the method, glaze coloring materials are omitted in production procedures, and accordingly the method is a green and environment-friendly production process.