Drilling head capable of drilling into rock used for engineering pile

The invention relates to a drilling head capable of drilling into a rock used for an engineering pile. The drilling head comprises a small-diameter down hole hammer body and an impactor which are positioned at the center of the drilling head, cutting teeth and a cutting teeth and cutting teeth seats for fixing the cutting teeth, spiral blades used as a long spiral drilling head, a rotary digging and drilling barrel used as a rotary digging machine drilling head and valves connected with the cutting teeth; the spiral blades are welded on the down hole hammer body; the steel cutting teeth seats are welded at the bottom ends of the spiral blades; the cutting teeth are arranged on the cutting teeth seats; the down hole hammer body is connected with a spiral drilling rod; one spiral blade is connected with the other spiral blade on the spiral drilling rod; the small diameter down hole hammer body is positioned at the center of the rotary digging and drilling barrel and is fixed with the rotary digging and drilling barrel through welding; the cutting teeth seats are arranged at the bottom of the rotary digging and drilling barrel and are fixedly connected with the down hole hammer body and the rotary digging and drilling barrel; the cutting teeth seats are provided with the cutting teeth and are connected with the valves; and the upper end of the down hole hammer body is connected with the spiral drilling rod. The drilling head has the advantages of being high in speed, pollution-free and low in manufacturing cost when hard rock is drilled.