The communication base station power supply system is a small high-end power supply based on high-performance uninterruptible power supply with a digital controller. It adopts advanced design such as high-efficiency conversion topology, intelligent charging control, automatic battery maintenance, and real-time sampling of main states.It is suitable for 19 inch standard cabinet in small communication base station, and areas with strict environmental protection and safety requirements, such as: residential areas, hotels, shopping malls, etc. It has built-in large capacity lithium iron phosphate batter pack, charging converter, battery management, seamless switch, LCD display, and full function module of RS485 communication. It has small size, long life span, stable and reliable performance, and environmental protection. It is maintenance free and can be widely used in energy storage systems for indoor communication base stations.