Embodiments of the invention disclose an early warning method, device and system for mountain torrents and debris flows, a storage medium and a program product, relate to the technical field of earlywarning of the mountain torrents and the debris flows, and solve the problems of limited early warning time, inaccurate early warning and the like of the existing early warning of the mountain torrents and the debris flows. According to the main scheme, the method comprises the following steps of acquiring lightning information and previous rainfall amount information of at least three coordinatepositions in a preset range, wherein the three coordinate positions are not on a straight line; computing a coordinate position of the thunder and lightning according to the lightning information of the three coordinate positions; counting the number of times of thunder and lightning occurring in the preset range according to the computed coordinate position of the thunder and lightning; and carrying out early warning on the mountain torrents and the debris flows through the number of times of thunder and lightning occurring in the preset range and/or the previous rainfall amount information.The method, the device and the system are mainly used for early warning of the mountain torrents and the debris flows.