The utility model discloses a dig combination drilling tool of rig soon relates to the basic construction field of building, include just to linking to each other and the last barrel of inside intercommunication and the lower barrel that the diameter is less than the barrel, being close to down on the lateral wall of last barrel, the one end of barrel evenly is provided with a plurality of teeth or bit along the circumferencial direction, cylinder side wall goes up near that is close to teeth or bit and has seted up a plurality of boring mud mouths down, down the barrel is equipped with the bottom plate that the activity was opened and shut on keeping away from a terminal surface of barrel, goes up the barrel and keeps away from down and also offered a plurality of boring mud mouths on the terminal surface of barrel, just upward is fixed with the spiral steel band on the lateral wall of barrel, the boring mud that the spiral steel band is used for shifting under the teeth or bit brill arrives go up in the boring mud mouth of barrel. The utility model discloses the straightness that hangs down that drills can be effectively guaranteed, the drilling quality is improved.