NOVELTY - Decomposition and coupling of sludge or organic garbage comprises conveying sludge or the organic garbage into low-temperature desiccation cracking furnace for splitting decomposition, transporting parts of carbonized substance into moderate-temperature carbonizing furnace for carbonization, using organic biological carbon as raw material of organic soil fertilizer or soil modifier, transporting left solid carbon into high-temperature fusion activating device, filling oxygen-enriched air into device and spraying liquid from regulation solution storage tank.    USE - Method for decomposing and coupling of sludge or organic garbage used as raw material of organic soil fertilizer or soil modifier (claimed).    ADVANTAGE - The method has simple process and product diversification.    DETAILED DESCRIPTION - Decomposition and coupling of sludge or organic garbage comprises:    (A) conveying sludge or organic garbage with moisture of 35-80% into low-temperature desiccation cracking furnace (3) for splitting decomposition to obtain parts of carbonized substance, at cracking temperature of 150-450 degrees C for 20-90 minutes, conveying cracked gas into first condenser (6) for condensing, transporting condensed oil tar into regulation solution tank (7) and conveying uncondensed gas into multiple-stage balanced combustion chamber for burning or conveying it into a funnel (14) through deodorizing device (10) by a draught fan (12) for discharge, and using carbonized substance as raw material of organic soil fertilizer or processing further treatment;    (B) transporting parts of carbonized substance into moderate-temperature carbonizing furnace (2) for carbonization to obtain organic biological carbon, carbonizing at 400-650 degrees C for 10-60 minutes, conveying gas produced by carbonization into second condenser (13), transporting condensed oil tar into regulation solution storage tank (7), conveying uncondensed gas into multiple-stage balanced combustion chamber for burning, and using organic biological carbon as the raw material of soil modifier or processing for further treatment;    (C) conveying mixture comprising carbonized substance, organic biological carbon, sludge containing moisture of 10-35 wt.% and straw containing moisture of less than 20% or organic garbage into high-temperature pyrolyzing furnace (1) for gasification, gasifying at 800-1100 degrees C for 5-20 minutes and air supply at 0.15-0.55 of theoretical burning quantity demand, conveying produced combustible gas with thermal value of 7000-15000 JK/m3 into multiple-stage balanced combustion chamber (11) in excess air coefficient of 1.05-1.3, using exhaust gas produced by burning as heat source to separately convey into moderate-temperature carbonizing furnace and low-temperature desiccation cracking furnace, using exhaust gas from moderate-temperature carbonizing furnace as the heat source to convey into low-temperature desiccation cracking furnace, applying lime powder to neutralizing exhaust gas from low-temperature desiccation cracking furnace, transporting exhaust gas into a funnel through bag-type dust collector (8) and selectively through a condensate recovery plant (9) in turns for discharge;and    (D) adding nutrition regulator and pH regulator into regulation solution tank, transporting left solid carbon into high-temperature fusion activating device (4) after producing gas in high-temperature pyrolyzing furnace, filling oxygen-enriched air with oxygen content of 30-95 vol.% into device, activating at 800-1200 degrees C for 0.5-5 minutes, spraying liquid with carbon proportion of 180-300 g/kg from regulation solution storage tank, and cooling solid to obtain composite biological carbon.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic diagram of the decomposition and coupling of sludge or organic garbage.    High-temperature pyrolyzing furnace (1)    Moderate-temperature carbonizing furnace (2)    Cracking furnace (3)    High-temperature fusion activating device (4)    First condenser (6)    Regulation solution storage tank (7)    Regulation solution tank (7)    Bag-type dust collector (8)    Condensate recovery plant (9)    Deodorizing device (10)    Multiple-stage balanced combustion chamber (11)    Draught fan (12)    Second condenser (13)    Funnel (14)