Abstract: The present invention relates to an apparatus for heat-treating waste matters, and more particularly an ecological apparatus for heat-treating waste matters, which enables waste matters such as various industrial wastes, city-living wastes and various high polymeric chemical wastes to be subjected to heat treatment at a lower temperature under vacuum in a heat-treating vessel without discharging pollutants produced during the heat treatment such as carbon, tar, noxious gases, malodors, and dust by treatment in a filter mechanism.