A marked line removing vehicle for highway construction comprises a flat panel transporting truck, a double-disc type high pressure water removing trolley is arranged on the lower portion of the frontend of the flat panel transporting truck through a front swing lifting mechanism, a supporting frame and a pulpwater collecting and draining device located on the rear side of the supporting frame are arranged on a chassis of the flat panel transporting truck, a clean water tank is arranged in the supporting frame, a hydraulic system is arranged on the lower portion of the chassis of the flat panel transporting truck, an engine, a diesel tank, a power generator, a storage battery, an upper water pump, a high pressure water pump, a vacuum pump, a first-level filter system and a second-level filter system are arranged on the supporting frame, and a pulpwater inlet of the pulpwater collecting and draining device is connected with a pulpwater suction port of the double-disc type high pressurewater removing trolley through a flexible connection type slag suction pipe assembly. The marked line removing vehicle is convenient to operate, convenient to use and very good in removing effect, and can effectively improve the construction efficiency and the construction effect. Meanwhile, the marked line removing vehicle improves the automation degree of high pressure water removing, relievesthe labor intensity of workers, and accordingly promotes the popularization and application of high pressure water at the aspects of automation and industrialization.