NOVELTY - Device for granulated organic substances conversion into gaseous fuel, comprises: (a) a furnace, connected to the heating chamber, enclosed in the thermal insulation shell; (b) vertical retort with the possibility of output of pyrogases in the lower portion of the retort, which contains a bottom with openings; (c) one or more openings with adjacent gas flues for output of pyrolytic gases from the retort is arranged in the lower portion of the retort above the bottom; and (d) an opening with adjacent gas flues for introduction of recycle gases is arranged in the upper portion of the retort.    USE - The device is useful for granulated organic substances conversion into gaseous fuel (claimed).    DETAILED DESCRIPTION - Device for granulated organic substances conversion into gaseous fuel, comprises: (a) a furnace, connected to the heating chamber, enclosed in the thermal insulation shell; (b) vertical retort with the possibility of output of pyrogases in the lower portion of the retort, which contains a bottom with openings; (c) one or more openings with adjacent gas flues for output of pyrolytic gases from the retort is arranged in the lower portion of the retort above the bottom; and (d) an opening with adjacent gas flues for introduction of recycle gases is arranged in the upper portion of the retort; where the device contains two heat exchangers, not mixing the media; in the first heat exchanger the heating medium is pyrolytic gas coming from the retort, the heated medium is recycle gas; in the second heat exchanger the cooled medium is pyrolytic gas coming from the first heat exchanger, the cooling medium is water; the device comprises a container for pouring of ashes through the openings in the bottom with gasproof sluice valve; inside the container a heat exchanger of cooling the ashes and heating the air, entering the furnace, is arranged; two additional opening with adjacent gas flues are arranged in the retort; the first additional opening is disposed at a distance of 0.5-0.6 of the overall height of the retort from the first opening; the second heat exchanger is made in the form of steam generator; the first heat exchanger is made in the form of three sections, communicated along the motion of the heating medium; in the first section a part of recycle gas is heated to 250-400 degrees C and is introduced into the retort through the opening in the upper portion; in the second section the second part of recycle gas is heated to 700-850 C and is introduced into the retort through the first additional opening; in the third section the steam, produced in the second heat exchanger, is overheated to the temperature of not less than 900 degrees C and is introduced into the retort through the second additional opening in the quantity, equal to or exceeding by not more than to 50-100% the quantity, required for complete conversion of organic substance into the gaseous fuel; the retort has rectangular cross section with the ratio of width to the length of 1:5-15, and the inner layer of thermal insulation shell and retort are made of refractory material with maximum operating temperature of at least 1600 degrees C.