The utility model discloses an intelligent optical fiber sensing system for periphery safety guarding of an island, which comprises an industrial personal computer, a specialized alarm module, a video signal acquiring module and a relay linkage output module; wherein the specialized alarm module, the video signal acquiring module and the relay linkage output module are connected with the industrial personal computer. The industrial personal computer is furthermore connected with an optical cable vibration invasion signal acquiring module. The optical cable vibration invasion signal acquiring module is connected with a video monitoring module. In the intelligent optical fiber sensing system, according to a specific requirement for safety guarding of the island, for aiming at invasion threat mode of underwater diving of frogmen, water-surface intruding of ships, underwater intruding of submarines and so on, a safety protection system is built by means of optical fiber sensing and optical communication in a manner of linkage with other alarm equipment such as a monitoring camera, an audible and visual alarm and an alarm loudspeaker, thereby realizing a purpose of performing omnibearing and three-dimensional safety guarding monitoring on a specified protecting area