Bevel shingle composite pipe having double-layer material

The present invention is to provide a bevel storeyed composite pipework having double-layer material which uses an inner layer material and an outer layer material with different functional characteristics. The two materials are cut into a plurality of slices with specific cutting shape respectively and compiled in a die with specific bevel chi in a longitudinally staggered way with a shift angle beta. Finally, the materials are heated and pressed by a thermal press machine so as to form an inner layer, an outer layer, and a staggered layer. Because the slice shape of the inner layer material and the outer layer material has a special design, the inner layer, outer layer and the staggering layer can be pressed with a average shaping pressure during the die casting process, which makes that each layer has a density needed so as to obtain a high structural strength and that the inner and the outer part satisfy different functional needs.