The horizontal
directional drilling device comprises a rack, a push-pull frame is connected to the rack in a sliding mode, a hydraulic oil cylinder is installed at the
tail of the rack, the output end of the hydraulic oil cylinder penetrates into the rack to be fixedly connected with the push-pull frame, a
hydraulic motor is installed at the top of the push-pull frame, and the
hydraulic motor is connected with the push-pull frame. The output end of the
hydraulic motor is connected with a speed
reducer, the output end of the speed
reducer is connected with a
threaded rod, a hydraulic chuck is installed at the front end of the
machine frame, a hollow
drill rod is clamped in the hydraulic chuck, and the two ends of the hollow
drill rod are provided with an external thread connector and an internal thread connector respectively. The
threaded rod is fixed to the internal thread connector in a threaded connection mode, and the external thread connector is fixed to the
drill bit in a threaded connection mode. The device has the beneficial effects that through the design of the drill rod discharging mechanism and the drill rod supporting mechanism, the automatic discharging action of the hollow drill rod can be achieved, manual installation is not needed, and the drilling efficiency can be improved while the construction safety is improved.