High pressure water removal line uses high-pressure water jet to remove old markings, which can completely remove all kinds of old markings on road surfaces. Due to the combined crushing effects of water jet erosion, wedging, shearing, and grinding, high-pressure water removal can completely remove old markings in the potholes and depressions of the road surface material during the removal process, revealing the road surface itself. A high-pressure water jet with enormous energy and supersonic motion can completely remove old marking bodies. At the same time, due to the pressure of high-pressure water being lower than the compressive strength level of road surface materials, high-pressure water line removal operations will not cause any damage to the road surface;