DRILLING DEVICE AND DRILLING METHOD THEREFOR

A drilling device and a drilling method therefor. A mounting cylinder (5) is disposed in a housing (12), a motor (4) is mounted in the mounting cylinder (5), a shafting (7) is rotatably mounted in the mounting cylinder (5), one end is connected to an output end of the motor (4), and the other end is provided with a supporting part for supporting a cam (8); the cam (8) may be relatively and slidingly sleeved on the shafting (7) in an axial direction, the bottom surface has a height difference in the axial direction, the bottom surface of the cam (8) is supported by the supporting part, and the cam (8) is opened with a notch; one end of an impact hammer (9) is connected to the cam (8), the other end is an impact end, the impact hammer (9) is sleeved by a driving spring (10), one end of the driving spring (10) is connected to the impact hammer (9), and the other end abuts against the mounting cylinder (5); and the lower portion of the impact hammer (9) is provided with a head cone (13) connected to a lower end o