The invention discloses a method and a 
system for positioning 
coal rock dynamic disaster through infrasonic wave monitoring. The 
system comprises a monitoring main 
station and a plurality of monitoring substations, and the monitoring substations are connected with the monitoring main 
station through a 
fiber optic network; each monitoring substation is composed of three infrasonic wave sensors arranged in a 
triangular form, and the infrasonic wave sensors are connected with an infrasonic wave monitor; and the monitoring main 
station is provided with a computing 
server. The positioning method isthat the main station computing 
server filters collected data, the time-
frequency analysis is performed on the data by the short-time 
Fourier transform (STFT), the frequency 
energy density is compared, signals of the main 
frequency band are extracted, and the calculation result is positioned through 
statistical analysis and time 
delay estimation theory. The 
system monitors the infrasonic wave 
signal generated by the fracture of the loaded 
coal rock. Through this method, the non-contact and regional tests are carried out on the 
stress distribution state of the surrounding rock of the tunnel ormines to determine the area of 
coal rock fracture and stress anomaly. The method is simple in installation and operation, has little 
impact on production, and has a large detection range and a long detection distance.