A long-distance powering system for communication system, the core is: the long-distance powering system according to the present invention comprises an office side power supply section and a remote power supply module connected to it, said office side power supply section includes at least two office side power supply modules, and said office side power supply modules are set in parallel to provide power for the remote power supply module. The present invention provides redundant power backup for the remote power supply module and ensures the reliability of normal communication traffic in network communication system by arranging at least two office side power supply modules in office side power supply section and setting the office side power supply modules in parallel to provide power for the remote power supply module; it also reduces effectively the number of the office side power supply modules in the office side power supply section and saves space of machine room and makes it convenient to monitor and manage the office side power supply modules by setting the office side power supply modules in parallel to provide power for several remote power supply modules; so it realizes the objects to enhance the reliability of communication traffic, improve the integration of office side equipments and reduce the cost of network communication system.