Screw drill for petroleum drilling machinery

The utility model discloses a screw drill for petroleum drilling machinery, which structurally comprises a support, a chassis, a support frame, an engine, a rotating device, blades and a rotating shaft, the supports are respectively and horizontally arranged at four corners of the chassis, and the chassis is positioned at the lower end of the support frame and is connected with the support frame and the support frame. The supporting frame and the rotating shaft are horizontally arranged, the sliding rail at one end is movably matched with a shell of the rotating device, one end of the engine is welded to the upper portion of the rotating device, the lower end face of the engine is movably connected with the rotating shaft in a clamped mode, the rotating device is movably clamped to the upper end of the rotating shaft, and a pulley on the left side of the shell is clamped with the sliding rail on the supporting frame. The blades are evenly distributed on the outer side of the rotating shaft in a rotating mode,