The optical fiber perimeter security area protection monitoring system is mainly composed of optical fiber perimeter security monitoring host and detection optical fiber cable.Optical fiber perimeter security monitoring host can play the role of perimeter protection monitoring by laying a core of optical fiber cable in the outer protection area of railway fence.That is, when someone or an animal walks back and forth in the perimeter protection zone, it will trigger the optical fiber perimeter security exclusion zone protection monitoring system and give an alarm.