Low-temperature full-volume tank with low-liquid-level material extraction device

The invention provides a low-temperature full-volume tank with a low-liquid-level material extraction device. The low-temperature full-volume tank comprises an inner tank, an outer tank, an operation platform and the material extraction device capable of extracting low-liquid-level materials, wherein the material extraction device comprises a material circulating tank and a low-temperature pump which are mounted on the operation platform, a first Venturi mixer mounted at the bottom of the inner tank and a corresponding connecting pipeline; and a low-temperature medium in the material circulating tank can enter the first Venturi mixer through the low-temperature pump and a leading-in pipeline, so that the low-temperature medium in the inner tank can enter the first Venturi mixer through a suction hole of the first Venturi mixer under the action of pressure difference, and the low-temperature medium enters the material circulating tank through a leading-out pipeline after being mixed. According to the low-tempe