Hydraulic push type horizontal directional coring device

The utility model relates to the field of engineering geological survey, in particular to a hydraulic push type horizontal directional coring device. The coring device comprises a casing pipe, a coring pipe assembly and an adapter, the casing pipe and the coring pipe assembly are both of a cylinder structure, the coring pipe assembly is coaxially arranged in the casing pipe, the adapter is of a cylinder structure matched with the casing pipe and coaxially arranged on the rear side of the coring pipe assembly, and the coring pipe assembly is arranged on the casing pipe. The coring pipe assembly is arranged in the casing pipe and is in sliding connection with the inner wall of the casing pipe, under the action of external force, the adapter pushes the coring pipe assembly to move in the axial direction of the casing pipe till the front end of the coring pipe assembly stretches out of or retracts back into the casing pipe, and the adapter and the coring pipe assembly are provided with a first channel and a secon