Horizontal well double-channel drill rod drilling device

The utility model discloses a horizontal well double-channel drill rod drilling device which comprises a flow control unit and a drilling tool assembly and further comprises a driving adapter, and thedriving adapter is connected with the drilling tool assembly at the bottom of a drilled well through a double-channel drill column and a connector adapter. In the embodiment of the utility model, broken rock strata generated by well drilling can be discharged, and the driving adapter is connected to the top of the double-channel drill string. The adapter includes a booster pump and a negative pressure pump, the pump permitting mud to be pumped to the outer pipe and permitting return flow from the inner pipe to be directed back to the mud system of the ground; the resistance of the drill rod in a working state can be reduced; the dual-channel drill string allows two different types of fluids to be used in a well during drilling; low-density and low-viscosity active drilling fluid circulates in the outer pipe and t