Drilling device for coal mine all-dimensional automatic drilling machine

The utility model discloses a drilling device for a coal mine all-dimensional automatic drilling machine. The drilling device comprises an anchoring support, a rotary drilling frame, a clamping device and a power head. The anchoring support comprises two anchoring supporting oil cylinders, a sliding frame, a sliding oil cylinder, a rotating device and a connecting table. A water supply transmission device is fixed in an output main shaft of the power head; the water supply transmission device comprises a transmission rod assembly and a water supply assembly. By means of the detachable assembly and disassembly transmission rod assembly in the output main shaft of the power head, in the drilling or pulling-out process, the driving drill rod drives other drill rods to drill, the hydraulic rubber sleeve chuck is only used when the drill rod is disassembled, and the problem that the hydraulic rubber sleeve chuck is prone to being damaged is solved; meanwhile, the water supply assembly is assembled at the rear end