Vacuum powder cryogenic liquid storage tank is a commonly used and advanced long-term storage equipment for cryogenic liquids. It has the advantages of large storage capacity, adjustable pressure, low evaporation rate, safety and reliability, etc. It is widely used in industrial gases, liquid oxygen, liquid nitrogen, and liquid. For the storage of argon, liquid carbon dioxide, ethylene and liquefied natural gas (LNG), the storage tank adopts a double-layer cylindrical structure, and the interlayer is filled with insulation material pearl sand and evacuated. It is mainly composed of inner tank, outer tank, insulation structure, piping system and safety accessories And other composition.