Double-channel water path independent shunting controllable cave forming device

The utility model relates to a double-channel waterway independent shunting controllable hole-making device, which comprises a double-wall drill rod joint, an inner pipe, a piston, an outer shell, a blade, a catcher and a drill bit, the front end of the double-wall drill rod joint is connected to the rear end of the outer shell, and the front end of the outer shell is connected to the drill bit through the catcher; the front end of the inner pipe extends into the outer shell and is provided with an inner pipe flange abutting against the inner wall of the outer shell, the piston is arranged in the outer shell in a sliding mode, a high-pressure sealing cavity is formed between the rear end face of the piston and the front end face of the inner pipe, a center through hole is formed in the middle of the inner pipe, and the outer shell is provided with a plurality of annular through holes formed in the axial direction. The front end and the rear end of each annular through hole are communicated with the interior o