The invention relates to a phone bill processing system of a communication network, which comprises an original phone bill generating device, a charging center, a comprehensive platform of an interface message processor, a configuration module, a pile module containing databases, a phone bill processing module and a dynamic link library; the comprehensive platform of the interface message processor collects all original phone bills from the original phone bill generating device to a target directory by a file transfer protocol; the corresponding dynamic link library is used according to configuration and the phone bill processing module exchanges, filters and sorts the original phone bills to generate a target phone bill meeting requirements; data are sent to the charging center and stored in the databases by the pile module; the configuration module can make the exchange forms and phone bill sorting of the original bills and target formats according to the requirements of users. The phone bill processing system solves the problems that overstocked phone bills influence processing efficiency and the cost of the system is high in the existing system, also meets the charging requirements of various businesses and realizes the purposes of lowering the cost of a charging system and promoting the stability, reliability, expansibility and commonality of the charging system.