The invention relates to the technical field of buildings, in particular to a metal roof. The metal roof comprises a roof plate, wherein the roof plate comprises a bottom plate layer, a sandwich layerand a surface plate layer which are sequentially arranged from bottom to top, the sandwich layer comprises a dustproof layer, a sound absorption layer, a supporting layer, a steam insulation layer, afirst heat preservation layer and a first waterproof layer which are sequentially arranged from bottom to top, a primary purline is arranged below the bottom plate layer, a secondary purline is arranged above the primary purline, the secondary purline is embedded in the sandwich layer, the upper side wall of the secondary purline is provided with a fixing seat for allowing the surface plate layerto be mounted, the fixing seat is arranged above the sandwich layer, a joist is arranged above the roof plate, the joist is fixed on the upper side wall of the surface plate layer through a fixture,and a decorative plate is arranged above the joist. The metal roof has the advantages that heat preservation and heat insulation, noise reduction and water proofing can be realized, and the service life is long.