Woodworking flat drill

The invention relates to a woodworking flat drill. A cutting head comprises at least three cutting blades radially distributed at equal distance with the axis of a drill handle as the center. Self-tapping threaded grooves are formed in the side faces of the upper ends of the cutting blades, arc grooves are further formed in the positions, at the lower ends of the self-tapping threaded grooves, ofthe side faces of the cutting blades, and the arc grooves comprise transverse arc grooves and drill tip arc grooves which are sequentially arranged from inside to outside. A thickened arc groove is formed in the side face, at the lower end of the corresponding arc groove, of each cutting blade. Each thickened arc groove comprises an inclined arc groove, a transverse arc groove and a drill tip arcgroove which are sequentially arranged from inside to outside to form a chip removal groove. The woodworking flat drill has the advantages that the dual-blade structure is changed into the structure with at least three blades, the perforating speed of the cutting head can be higher, cutting is sharper, and drilling roundness is increased; meanwhile, uniform stress in the cutting process can be guaranteed, and then cutting precision is guaranteed; and in addition, the chip removal grooves are additionally formed, cutting resistance can be reduced, smooth chip removal is guaranteed, and therefore the service life of the woodworking flat drill is prolonged.