Multiple-cutting-edge steel plate drill

The utility model relates to a multi-cutting-edge steel-plate drill which is provided with a cylindrical through-hole in axial direction and is suitable for on-site drilling hollow drills. The external surface of a drill body is provided with a guide spiral edge lobe and a scrap-removal spiral groove. The taper of the external surface with a convergent diameter is arranged from an end face to a drill tail. The taper of an internal surface is opposite to the external surface. The end part of the drill body is provided with a plurality of flat-tooth cutting edges and sharp-tooth cutting edges which are arranged uniformly and alternately in sequence. The utility model has light self weight and small cutting area, adopts the interlaced and separated cutting of flat and sharp cutting edges, and is convenient for inputting cooling liquid in the through-hole of the drill body for cooling. The utility model can realize high speed and facile cutting, can enhance efficiency and lowers power consumption.