Drilling machine for road construction

The utility model provides a drilling machine for road construction, which comprises a connecting mounting seat, and hinge plates are arranged at two ends of the connecting mounting seat. A detachable bearing seat is detachably arranged in the middle of the connecting mounting seat, and a hydraulic motor is mounted at the upper part of the detachable bearing seat; a water spraying nozzle is arranged at the lower part of the connecting mounting seat; a drill rod in transmission connection with the hydraulic motor is arranged on the lower portion of the detachable bearing seat, auger blades are arranged on the outer side of the drill rod, a buffer mechanism is arranged between the drill rod and the hydraulic motor, and a detachable drill bit is arranged at the bottom end of the drill rod. The connecting mounting seat is fixedly connected with the detachable bearing seat through a bolt, the detachable bearing seat can be fixed with the connecting mounting seats with different structures through bolts, intercommu