The invention discloses a metal band sawing machine for cutting a slice wind-power flange, and belongs to the technical field of mechanical equipment. A saw band carried by the sawing machine can perform horizontal cutting, and a carried workpiece table can move horizontally for feeding. The key points of the technical scheme are that the metal band sawing machine comprises a gantry framework, wherein the gantry framework is formed by vertically arranged gantry columns (1 and 2) with rectangular cross sections, as well as a movable cross beam (3) which is transversely placed at the upper part in the front and provided with a rectangular cross section; guide rails (12 and 13) are arranged below the movable cross beam (3) between the gantry columns (1 and 2); and a cylindrical moveable workpiece platform is arranged on the guide rails (12 and 13). The metal band sawing machine can achieve cutting of the slice wind-power flange by the disc saw band (8), and is simple in structure.