The utility model provides a prevent that earth tunnel who blocks up manages canopy drilling drilling tool, belongs to the drilling equipment who uses in the engineering construction. It includes drill bit and drilling rod, and its key technology lies in that the drill bit includes the hood, steel rib outside arranging on the hood, and broken tooth is arranged on outer steel rib's surface, add at the drilling rod head and weld interior stiffening rib, steel rib in the welding on the interior stiffening rib, the hood is installed at the drilling rod head, and the surface of drilling rod sets up spiral teeth or bit and constitutes spiral drill rod. The utility model discloses the beneficial effect who has is: hood on the drill bit plays direction, squeezing action to the breakage part, is favorable to very much the breakage to be crept into, the drilling rod head can guarantee with welding interior stiffening rib that drilling tool inner structure is stable, does benefit to drilling, the surface of drilling rod sets up spiral teeth or bit and constitutes spiral drill rod, is used for the stable and boring mud output of drill bit especially, and boring mud output space is big, can return the cause of a quarrel smoothly, the hole of can not collapsing among the tool joint, and drilling efficiency is high, satisfies long and large pipe shed drilling construction.