The utility model relates to a wind generating set fire hazard monitoring system based on optical fiber sensors, comprising a fire hazard detecting module, a signal processing module, a control processing module and a monitoring module. The fire hazard detecting module comprises a or a plurality of detecting channels, and the detecting channels are optical fiber sensors; the signal processing module is the processing center of the acquired data of the detecting module, and is a detecting host; wherein the detecting host is connected with the one or the plurality of optical fiber sensors; the control processing module is a fire hazard processing control center, and comprises a PC, a communication module, a fire hazard alarm controller, a fire extinguishing system and an image monitoring device; wherein the detecting host is connected with the PC, the image monitoring device and the fire hazard alarm controller separately, the fire hazard alarm controller is connected with the fire extinguishing system, and the PC is connected with the communication module; the monitoring module comprises a monitoring terminal, and the communication module is connected with the monitoring terminal. The wind generating set fire hazard monitoring system based on the optical fiber sensors of the utility model possesses a real-time distributed monitoring capability, can carry out multi partition and focus monitoring, and can be equipped with multistage alarms, thereby extinguishing the fire in early stage.