Liquid nitrogen filling tank series uses small amount of liquid nitrogen vaporizing to increase the pressure inside the tank, so that the tank can automatically discharge liquid nitrogen to other containers. It is mainly used to transport and storage liquid medium and also be the cold source of other refrigeration equipment. The monitoring controller terminal and software can be matched to transmit remotely liquid nitrogen level and pressure data and to realize the function of remote alarm for low level and over pressure, it can be also pressure boosted manually and remotely to control filling. The liquid nitrogen filling tank is widely used for mould industry, livestock industry, Medical, semiconductor, food, low temperature chemical, aerospace, military and such industry and area.