The invention discloses an unmanned watching 
system for railway on-site operation protection based on coreless 
optical fiber sensing, and is suitable for the fields of railway construction, 
optical fiber sensing and the like. The unmanned watching 
system consists of a measuring module and a receiving module, wherein the output end of a 
laser source (1) of the measuring module is connected with the input end of a phase modulator (2); the output end of the phase modulator (2) is connected with the input ends of coreless optical fibers (3); vibration signals are applied to the coreless optical fibers; the output ends of the coreless optical fibers (3) are connected with the input end of a photoelectric 
detector (4); the output end of the photoelectric 
detector (4) is connected with the input end of a 
signal processing module (5); the output end of the 
signal processing module (5) is connected with the input end of a 
wireless transmitting module (6); the output end of a 
wireless receiving module (7) of the receiving module is connected with the input end of a 
signal processing module (8); the output end of the 
signal processing module (8) is connected with a display module (9) and a 
loudspeaker (10). Through the adoption of a coreless 
optical fiber sensing technology, the unmanned watching 
system can accurately position an approaching 
train, and has the advantages of low energy dependence, 
electromagnetic interference resistance, 
corrosion resistance and the like; the phenomenon that at mountain regions and curve regions, which are poor in observation conditions, protection personnel cannot inform on-site construction personnel to avoid a 
train in time can be avoided.