Drilling device for geotechnical engineering investigation

The invention discloses a drilling device for geotechnical engineering investigation, relates to the technical field of geotechnical construction, and mainly aims to solve the problem that the depth of drilling rock and soil is not prone to being controlled. The drilling device comprises a fixing frame, a drill pipe and a lifting mechanism for driving a drill bit to drill, the fixing frame is composed of three supporting vertical rods in triangular distribution and side connecting rods allowing the three supporting vertical rods to be connected and fixed to one another, a fixing table plate and an installation frame are arranged on the upper sides of the side connecting rods, the lifting mechanism comprises a screw and a drilling motor, an adjusting screw is further arranged on the installation frame, an installation plate is arranged on the adjusting screw, a pressure sensor is arranged at the upper end of the installation plate, a pressing plate is arranged on the bottom wall of theadjusting screw, and the