Numerical control grooving cutter and blade thereof

The numerical control grooving cutter comprises a cutter bar, a cutter head and a plurality of blades mounted on the cutter head, the cutter bar is fixedly connected with the cutter head, the blades are eccentrically arranged on the cutter head, cutting portions of the blades extend to the outer side of the circumferential surface of the cutter head, a first cutting edge is arranged on the cutting portion of at least one blade, and a second cutting edge is arranged on the cutting portion of at least one blade. A second cutting edge is arranged on the cutting part of at least one blade, arc-shaped surfaces bent towards the rotating direction of the blade are arranged beside the first cutting edge and the second cutting edge, the first cutting edge comprises an inclined cutting edge part and a chamfering part, the inclined cutting edge part and the axial direction of the cutter bar are arranged at a certain angle, the second cutting edge is a V-shaped cutting edge, and the chamfering part and the inclined cutti