Hydraulic square pile drill bit

The utility model belongs to the technical field of drilling equipment, and particularly relates to a hydraulic type square pile drill bit which comprises a power head part and an excavating component, the power head part comprises a power box, a conversion connecting plate is fixedly arranged on the upper side wall of the power box, a connecting square head is fixedly arranged on the upper side wall of the conversion connecting plate, and the connecting square head is fixedly connected with the excavating component. A modified drill rod is rotationally arranged on the front side wall of the power box, positioning square heads are fixedly arranged at the two ends of the modified drill rod, and first connecting threaded holes which are evenly distributed are formed in the peripheries of the positioning square heads; the excavating component comprises a wheel body, an excavating executing element is fixedly arranged on the side wall of the wheel body in a spiral shape, and evenly-distributed Baishi teeth are fi