The grassland fire prevention system employs an intelligent dual-spectrum recognition system—combining visible-light smoke and fire detection with infrared thermal imaging for temperature-based identification—along with cameras, telephoto lenses, and backend monitoring software to detect smoke and fire and trigger automatic alarms. It utilizes the azimuth and tilt angles of a heavy-duty digital pan-tilt unit, the focal length of the telephoto lens, and a backend GIS management platform to automatically and precisely pinpoint the location of fire sources.