Drilling rod device used for deep-hole gas drainage drilling rig

The utility model discloses a drilling rod device used for a deep-hole gas drainage drilling rig. The device comprises a hollow drilling rod and a connecting rod, wherein the drilling rod is connected with the connecting rod in a demountable manner; a dextrorse spiral groove is formed on the circumference surface of the drilling rod in the axial direction, and a screw auger protruding out of the surface of the drilling rod is welded in the spiral groove. The utility model combines the slag discharge with the screw drilling rod with the air-force slag discharge, so that the drilling rod and the screw auger rotate together while drilling, and air is blown into a central hole of the drilling rod to discharge slag; and the drilling rod coordinates with the screw auger and rotates to discharge slag in a screw manner; and the device has the advantages of low probability of drill jamming, safety and reliability and great improvement of slag discharge effect, thereby facilitating to improve the drilling depth, shorte