Provided are, according to one embodiment of the present invention, a system for detecting and expressing an abnormal temperature at an industrial site by using a thermal imaging camera and generating an alarm to inform of same, and an operation method thereof, the system comprising: a camera module that creates a thermal image by photographing an industrial site; and a server that analyzes the thermal image received from the camera module and determines whether an abnormal temperature exists in the facility, wherein if an abnormal temperature appears in the thermal image, it notifies a manager of an abnormal facility event, such that an accident can be prevented in advance or an accident can be quickly dealt with.