Drilling rig for geotechnical engineering investigation

The utility model discloses a drilling rig for geotechnical engineering investigation, and relates to the technical field of geotechnical engineering equipment. The device comprises a fixed frame, wherein a movable frame plate is in sliding fit between two ends of the surface of the fixed frame; the lower surface of the movable frame plate is rotationally connected with a drill rod; a second servo motor is arranged at the inner bottom end of the drill rod; a first disc seat is fixedly arranged at the rotating shaft end of the second servo motor; a drilling head is arranged at the bottom end in the drill rod; a compression spring is arranged between the inner top of the drilling head and the inner bottom end of the drilling rod. The drilling head is driven by the compression spring to move upwards, the second servo motor rotates and drives the first disc seat to rotate, and the first triangular convex block on the surface of the first disc seat is matched with the second triangular convex block on the surface