Liquid nitrogen heating system and liquid nitrogen pump truck

The utility model relates to the technical field of oil exploitation equipment, and provides a liquid nitrogen heating system and a liquid nitrogen pump truck, and the liquid nitrogen heating system comprises a containing device used for containing heating liquid; the pumping-out device is communicated with the accommodating device; the heating furnace is used for heating the heating liquid pumped out by the pumping-out device; an inlet of the water-bath evaporator is communicated with the heating furnace, and an outlet of the water-bath evaporator is communicated with the accommodating device; and a liquid nitrogen inlet and a nitrogen outlet are formed in the water bath type evaporator. According to the liquid nitrogen heating system and the liquid nitrogen pump truck, the liquid nitrogen is heated through the heating liquid, and the exhaust temperature of the liquid nitrogen is controlled by adjusting the temperature of the heating liquid by controlling the displacement of the heating liquid or the injecti