The KW series water well drilling rig that also functions as a geothermal drilling rig can drill a 300m deep hole with a drilling diameter of 105-300mm. As a newly-developed multifunctional hydraulic drilling rig, it is highly efficient and energy saving. In practice, it is mainly used for drilling of water well, monitoring well, geothermal air-conditioner hole and anchoring hole, especially the ground water exploiting projects.