In order to meet the needs of current power communication operation and maintenance, an intelligent optical fiber on-line dynamic monitoring system based on optical power is proposed. A monitoring center and a front-end module are set up at the main station of the system, and the link is connected to the complete set of terminals of the station through the automatic protection unit optical power monitor(OLP), and then the optical power monitor(OPU) is used to capture the online optical power value and compare it with the preset threshold through the IP network to realize the intelligent online dynamic monitoring of the system. The practical results show that the system can quickly protect the faulty link and locate it accurately within 40 ms.