Dust-free drilling machine

The utility model discloses a dust-free drilling machine, and belongs to the technical field of exploration. Comprising a drilling machine, a water tank, a high-pressure water supply structure, a borehole inserting pipe, a big-end-up conical sleeve at the top of the borehole inserting pipe, a dust discharging pipe arranged on the upper portion of the borehole inserting pipe obliquely downwards, a closed soft plate at the bottom of the conical sleeve, a main spray head in the dust discharging pipe and a plurality of auxiliary spray heads on the upper portion in the conical sleeve. A drill rod of the drilling machine sequentially penetrates through the conical sleeve and the borehole insertion pipe from top to bottom, a through hole allowing the drill rod to penetrate through is formed in the closed soft plate, the auxiliary sprayers are arranged around the drill rod and spray towards the through hole, the main sprayer is arranged in the direction where the dust discharging pipe is located and sprays downwards