Geotechnical investigation drilling rig

The invention discloses a geotechnical exploration drilling device, and relates to the technical field of exploration drilling, the geotechnical exploration drilling device comprises: a movable fixing mechanism, the movable fixing mechanism comprises a movable seat; the lifting anti-deviation mechanism comprises a vertical frame, the vertical frame is fixed to the movable base, and an anti-deviation assembly is arranged at the bottom of the right side of the vertical frame; and the drilling mechanism comprises a third motor, the output end of the third motor is connected with a connecting assembly, the bottom end of the connecting assembly is detachably connected with a drill bit assembly, and the drill bit assembly slidably penetrates through the deviation preventing assembly. The anti-deviation assembly is arranged on the lower portion of the lifting anti-deviation mechanism, the anti-deviation assembly can limit the drill bit assembly, the drill bit assembly is prevented from deviating during drilling, the