NOVELTY - Cleaning gasification processing method comprises e.g. decreasing granularity of domestic garbage, converting into dry material and wet material, carrying out pyrolysis gasification process for dry material to produce high energy crude synthetic gas, carrying out plasma decomposition reaction for high energy crude synthetic gas, where coal tar and other toxic harmful substances produce semi high energy crude synthetic gas, carrying out multistage washing for semi high energy crude synthetic gas to remove nitrous oxide, chloride, fluorine, hydrogen sulfide, metal and dust.    USE - The cleaning gasification processing method is useful for domestic waste treatment (claimed).    ADVANTAGE - The method is simple and reduces emissions of dioxins, dust, nitrogen oxides, sulfur dioxide, malodorous gases, heavy metals and other pollutants in the fly ash.    DETAILED DESCRIPTION - Cleaning gasification processing method comprises decreasing granularity of domestic garbage, converting into dry material and wet material, carrying out pyrolysis gasification process for dry material to produce high energy crude synthetic gas, carrying out plasma decomposition reaction for high energy crude synthetic gas, where coal tar and other toxic harmful substances produce semi high energy crude synthetic gas, carrying out multistage washing for semi high energy crude synthetic gas to remove nitrous oxide, chloride, fluorine, hydrogen sulfide, metal and dust to produce clean high energy synthetic gas as an output fuel, taking pre-processed wet material, carrying out tempering and heating process, carrying out dry anaerobic gasification process to produce marsh gas, the marsh gas output as fuel gas, remaining material into dehydrating process to produce waste water and solid material, discharging the waste water through processing and carrying out pyrolysis gasification process for solid material to generate high energy clean synthetic gas, whose output as fuel gas. An INDEPENDENT CLAIM is also included for clean gasification processing system, comprising: preprocessing unit, which includes crushing device and depth dehydrating device connected in series, the crushing device is provided with material inlet, the depth dehydrating device is equipped with dry material outlet and wet material outlet; the pyrolysis gasification processing unit, which includes gasification furnace, plasma furnace and reacting synthetic gas purification device connected in series, the gasification furnace is equipped with feed inlet, the synthetic gas purification device is provided with high energy synthetic gas outlet port; dry anaerobic gasification process unit, which includes feedstock device, dry anaerobic gasification device and high efficientdehydrating device connected in series, the dry anaerobic gasification device is equipped with marsh gas outlet port and high efficientdehydrating device is connected with remaining material outlet port, the high efficient dehydrating device is provided with waste water outlet and solid material outlet; the preprocessing unit feedstock gasification furnace dry material outlet and pyrolysis gasification processing unit depth dehydrating device are connected, the wet material outlet and the dry anaerobic gasification process unit feedstock device are connected, the dry anaerobic gasification process unit feedstock gasification furnace and solid material outlet and the pyrolysis gasification processing unit high efficient dehydrating device are connected.