Self-pressurized liquid nitrogen tank is mainly used to transport and store liquid media, and can also be used as a cold source for other refrigeration devices. It can be equipped with liquid nitrogen tank monitoring terminal and monitoring software, which can realize the remote transmission of liquid nitrogen level, pressure and other data, realize low liquid level, overpressure remote alarm, and can also manually remotely pressurize and control replenishment. At present, it is mostly used in mold industry, animal husbandry, medicine,semiconductor, food, low temperature chemical industry, aerospace, military and other low temperature fields.