The invention relates to a low-temperature online management system. The system comprises a front-end detection device and a back-end management system, wherein the front-end detection device is usedfor providing detection data, comprising a liquid level, a pressure, a temperature and a vacuum degree, of a low-temperature liquid container; and the back-end management system is used for receivingthe detection data and performing analysis, processing and display on the detection data. All containers are subjected to unified management, and big data is adopted for performing analysis, so that the usage conditions of the containers, the consumption condition of liquid and the filling demands of users are accurately grasped; the filling demands of the containers are timely responded, and thefilling plans are reasonably arranged, so that the filling efficiency is improved, and the logistics cost is reduced; the abnormal states of the containers are timely discovered, and the maintenance plans are reasonably arranged, so that the maintenance efficiency is improved, and the maintenance cost is reduced; and the energy consumption condition is analyzed, and improvement measures are proposed, so that energy saving and efficiency improvement are facilitated.