Public facility monitoring method and system

The invention discloses a public facility monitoring method and system, and the method comprises the steps: obtaining a sensing signal collected by a passive sensor; public facility signal features in the sensing signals are extracted; when it is detected that the public facility signal features conform to preset sensing signal features, video data of a current public facility corresponding to sensing signals of the public facility collected by an image collection device arranged on the roadside is obtained, and the obtaining duration of the video data covers the duration of generation of the sensing signals of the public facility; extracting public facility image change features in the video data; and inputting the public facility signal features and the public facility image change features into a public facility state recognition model to obtain a state recognition result of the current public facility. The state of the public facility is monitored by multiplexing the real-time characteristics of the low-d