Drilling device convenient for sampling and used for geological survey

The drilling device comprises a bottom frame, a first motor, a second motor and a propelling barrel, a lead screw is fixed to the output end of the first motor, the outer end of the lead screw is in threaded connection with a moving block, a transverse plate is welded to the right side face of the moving block, the second motor is fixed to the upper portion of the transverse plate, and the propelling barrel is fixed to the lower portion of the bottom frame. A second spiral blade is fixed to the lower surface of a gear at the left end in the transmission mechanism, the propelling barrel is welded to the lower surface of a transverse plate, limiting plates are arranged on the front side and the rear side of the top end of the propelling barrel correspondingly, the upper surfaces of the limiting plates are welded to the lower surface of the transverse plate, and the bottom ends of the limiting plates are connected with a material collecting box; and a first spiral blade is mounted at the top end in the propellin