The utility model discloses a vehicular LNG (liquefied natural gas) gasifier with a hydraulic driving pump supplying fuels. The LNG gasifier comprises at least one LNG storage tank, an LNG pump, a hydraulic driving mechanism, an LNG gasifier and a natural gas pressure regulating valve. The hydraulic driving mechanism is connected with the LNG pump; an inlet and an outlet of the LNG pump are communicated with the LNG storage tanks and the LNG gasifier respectively; and an outlet of the LNG gasifier is communicated with the natural gas regulating valve. A vehicle-mounted hydraulic system serves as a power-driven hydraulic turbine to further drive the LNG pump to extract out LNG from the storage tanks, and accordingly reliability, controllability and quick-regulating capacity of delivering fuels are guaranteed; and the water-bath gasifier provides heat by the assist cooling liquid of a car engine, and accordingly gasifying speed of LNG and heat needed by LNG gasification under condition of full load of the large-power engine are guaranteed.