Drilling device for geotechnical engineering investigation

The utility model relates to a drilling device. The utility model relates to a drilling rig, in particular to a drilling rig for geotechnical engineering investigation. The drilling machine comprisesa drilling frame, a supporting platform, a drilling motor and a drilling rod. The drilling frame is vertically erected on the ground, the supporting platform is connected with the drilling frame in anup-down sliding mode through the lifting guide device, the drilling motor is fixed to the supporting platform, the drilling rod is vertically arranged below the supporting platform, the drilling rodis connected with the drilling motor and driven by the drilling motor to rotate, and material leaking holes are evenly formed in the circumferential face of the drilling rod in the axial direction. According to the utility model, the structure is simple, the lifting guide device is started to drive the supporting platform to move upwards; and in the lifting process of the drill rods, water in thedrill rods can leak out thro