The utility model relates to a track-driving suspension system for a road-track dual-purpose firefighting vehicle, which comprises a plurality of jacking assemblies, wherein each jacking assembly comprises two jacking mechanisms and a hydraulically-driven bridge assembly, the mirror images of a first jacking mechanism and a second jacking mechanism are symmetrical, the hydraulically-driven bridge assembly is fixedly connected with the first jacking mechanism and the second jacking mechanism, the first jacking mechanism and the second jacking mechanism respectively comprise a bracket assembly, a jacking oil cylinder, a damping structure and a hydraulically-driven assembly, the bracket assembly is respectively connected with the road-track dual-purpose firefighting vehicle and the jacking oil cylinder, the hydraulically-driven assembly is movably connected with the bracket assembly, the hydraulically-driven assembly is connected with the damping structure, and the hydraulically-driven assembly is fixedly connected with the hydraulically-driven bridge assembly. Through the track-driving suspension system for the road-track dual-purpose firefighting vehicle, the mechanical structure of a road-track dual-purpose firefighting-vehicle track system is simplified, so that the track system is more convenient to install and maintain, the weight and the installing space of the track system are reduced, and the carrying capacity of the road-track dual-purpose firefighting vehicle is increased.