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Aiming at the problem that the Uninterruptible Power System(UPS) room is unattended during operation and staff cannot timely troubleshoot faults, a UPS intelligent online monitoring system based on Advanced RISC Machine(ARM) and the Narrow Band Internet of Things(NB-IoT) is designed and implemented, consisting of a detection terminal, cloud server, and regulatory center. The detection terminal uses various sensors and detection circuits to obtain input and output voltage and current, load rate, battery power, and other data of multiple UPS devices, as well as temperature and humidity environmental parameters of the computer room. It sends them to the cloud server through wireless modules, and the supervision center obtains data from the cloud server. Users can log in to the supervision center to remotely query the working data of UPS. After testing, the system can achieve the collection and wireless transmission of various UPS data, and can query the UPS working status and issue instructions in real-time through the regulatory center, achieving the effect of real-time monitoring. It has the characteristics of accurate data measurement and good real-time response, reducing the workload of management personnel and improving the management efficiency of UPS.