Wear-resistant hard alloy drill bit

The utility model discloses an abrasion-resistant hard alloy drill bit which comprises a drill bit body and two sets of spherical teeth evenly installed on the top of the drill bit body, and a conical tooth is installed in the center of the upper end of the drill bit body through a connecting mechanism. The connecting mechanism comprises a connecting part, a flow channel, a connecting sleeve, a rotating rod, an outer hexagonal head, a set of opposite external threads, a set of opposite nuts and a set of clamping grooves. The drill bit has the advantages that the bevel gear is installed on the drill bit body through the connecting mechanism, when the bevel gear needs to be replaced, the outer hexagon head is rotated reversely, the connecting part at the bottom of the bevel gear is separated from a set of clamping grooves in the upper ends of a set of opposite nuts, and the double-lug lock washer is matched with the lock nut to achieve the anti-loosening effect; and the bottoms of the spherical teeth are connec