NOVELTY - An organic waste gasification system has a preprocessor (1) for preprocessing organic waste (501), a thermal decomposition apparatus (2) for thermal decomposition gasification of waste, and producing pyrolysis gas (201), and a gas reforming apparatus (3). The preprocessor has a processing tank (11) and a water vapor generator. The decomposition apparatus has a thermal decomposition tank (21) and a superheated steam generator. The gas reforming apparatus has a gas reforming tank (31) and hydrogen-oxygen gas generator in which a catalyst for hydrogen reforming reaction is accommodated.    USE - System used for gasifying organic waste (claimed) e.g. domestic waste.    ADVANTAGE - The organic waste gasification system is compact, economical and environmentally-friendly, and has simple structure. The generation of environmental impact substance e.g. dioxin is reliably suppressed.    DETAILED DESCRIPTION - An organic waste gasification system has a preprocessor for preprocessing organic waste, a thermal decomposition apparatus for thermal decomposition gasification of preprocessed waste, and producing pyrolysis gas, and a gas reforming apparatus for gas reformation of pyrolysis gas. The preprocessor has a processing tank and a water vapor generator. The preprocessing involves supplying water vapor (101) produced by the generator into processing tank containing organic waste, drying organic waste, and decomposing waste into organic material (502). The thermal decomposition apparatus has a thermal decomposition tank and a superheated steam generator. Superheated steam (102) produced by the generator is supplied to the thermal decomposition tank containing organic material, the thermal decomposition tank is maintained at hypoxic condition or anoxic state, and thermal decomposition gasification is performed. The gas reforming apparatus has a gas reforming tank and hydrogen-oxygen gas generator in which a catalyst for hydrogen reforming reaction is accommodated. Hydrogen-oxygen gas (103) produced by the generator and the pyrolysis gas are supplied to gas reforming tank, and pyrolysis gas is reformed into hydrogen rich gas (202) by reforming reaction. An INDEPENDENT CLAIM is included for gasification of organic waste.    DESCRIPTION OF DRAWING(S) - The drawing shows the flowchart of organic waste gasification system. (Drawing includes non-English language text)    Preprocessor (1)    Thermal decomposition apparatus (2)    Gas reforming apparatus (3)    Processing tank (11)    Thermal decomposition tank (21)    Gas reforming tank (31)    Water vapor (101)    Superheated steam (102)    Hydrogen-oxygen gas (103)    Pyrolysis gas (201)    Hydrogen rich gas (202)    Drained warm water (203)    Organic waste (501)    Organic material (502)