Passive garbage cinerator

The utility model relates to a waste material cinerator with preheating treatment, particularly a passive garbage cinerator. The utility model is a passive garbage cinerator which comprises a cinerator door, a grate, a hearth and a chimney. The utility model has the essential structure that a first chamber is longitudinally coated on the periphery of the hearth, and is a closed space, a heat conducting medium is arranged in the first chamber on which an inlet pipe and an outlet pipe for the heat conducting medium are arranged. The utility model has the advantages that the burning heat quantity at the rear part of the hearth is transferred to the front part of the hearth by the heat conducting medium in the first chamber to be used for preheating, drying and cracking garbage just put in the front part of the hearth so that the garbage generates water gas or semi-water gas with low cracking value, therefore the utility model has easy burning, increases the staying time of fume in the hearth so that the garbage is sufficiently bunt; the utility model makes the smoke discharge reach the national discharge standard without any power through dust removal of many times so as to save refractory materials on the periphery of the original cinerator, and has the advantages of portable structure and convenient transportation and management.