Drill bit for drilling machine

The utility model discloses a drilling bit for a drilling machine, and relates to the technical field of cutters. A connecting column is arranged at the bottom of a drill bit tip, a chip cutter is arranged at the bottom of the connecting column, a reamer is arranged on the chip cutter, a chip groove is formed in the side face of the chip cutter, a hole is formed in the chip cutter, a limiting ring is arranged at the top of the chip cutter, heat dissipation holes are formed in the limiting ring, and a drill bit handle rod is arranged at the top of the limiting ring. A cylindrical hole is formed in the drill bit handle rod, a limiting plate is arranged on the side face of the drill bit handle rod, a notch is formed in the limiting plate, and a fixing groove is formed in the drill bit handle rod. By means of the component provided with the reamer, when the perforating machine is used for perforating holes with different sizes, due to the fact that the reamer is arranged according to the gradient, perforating can