The utility model relates to an electric power facility field discloses a drilling machine that multiple functional electric power construction used very much. It includes excavator formula power car and hank head, and the articulated horizontal gird in flexible arm top is equipped with a drum on, and the drum upper end is equipped with the main shaft for hollow structure's hydraulic motor, and hydraulic motor connects the connector, and the connector can be connected by the axle with the drum with changeing, and the lower extreme of connector is connected and is gone up the flange, goes up the flange joint lower flange, and the lower flange is connected with the hank head, twist overhead end be equipped with the reinforcement for the cement spiral twist first. Because hollow structure is set to the main shaft with hydraulic motor, the hank head is connected with the main shaft through the connector again, makes and forms a cavity between connector and the main shaft, and when the hank head received the reaction force who comes from ground, the cavity had just played the cushioning effect, and reaction force can not direct action in main shaft to can not cause the injury to the main shaft, again since driver's cabin and flexible arm can rotate simultaneously, so can be under construction in narrow alleyway.