Deep drilling machine

The utility model provides a deep drilling machine which comprises a vehicle body, an operating arm and a drilling assembly, and the connecting end of the operating arm is rotatably installed on the vehicle body. The drilling assembly comprises a mounting rod, a guide rail, a driving structure and a plurality of drill rods, the mounting rod is mounted at the free end of the operating arm, the guide rail is mounted on the mounting rod and is consistent with the extending direction of the mounting rod, the driving part is slidably mounted on the guide rail, a drill bit is arranged at the bottom of one drill rod, and the driving part drives the drill rod to slide along the guide rail and drive the drill rod to rotate; and the mounting end of the drill rod is detachably mounted on the driving piece and can be spliced with another drill rod. Due to the design of the multiple drill rods, the drilling depth of the single drill rod is small, and the length of the guide rail is reduced, so that the overall height of t