NOVELTY - Producing organic fertilizer using city living sludge, comprises: (a) mixing city living sludge and an organic waste for agriculture; (b) adding high-temperature toxic actinomycetes, stirring and feeing into a composting groove; (c) forcing to make a hot blast into enter composting groove to heat the stack quickly and finishing once high-temperature fermentation; (d) turning the material, cooling and carrying out secondary middle-temperature fermentation; (e) drying, mechanically crushing and sieving piled material; and (f) detecting treated material with mass standard of organic fertilizer.    USE - The method is useful for producing organic fertilizer using city living sludge.    ADVANTAGE - The fertilizer improves soil fertility and crop yield, reduces treatment cost, and recycles the resources and has low-carbon economy.    DETAILED DESCRIPTION - Producing organic fertilizer using city living sludge, comprises: (a) mixing city living sludge (4 parts) and an organic waste for agriculture (one part) with specific proportion of the carbon/nitrogen of the mixing material is 30 plus minus 5, pH value is 6-7.5 and the moisture content is 60-70%; (b) adding high-temperature toxic actinomycetes into the mixing material, fully uniformly stirring and feeing into a composting groove to establish a stack by a forklift; (c) forcing to make a hot blast into enter the composting groove to heat the stack quickly, maintaining the temperature of the stack under the ventilation condition at 60 plus minus 5 degrees C for 7-10 days and finishing once high-temperature fermentation while reducing the moisture content of the material to 40-50%; (d) turning material, cooling to 40-50 degrees C, carrying out the secondary middle-temperature fermentation until the degradable organic matter is basically decomposed to stable state; (e) drying, mechanically crushing and sieving the piled material to the grain size of not greater than 2 mm; and (f) detecting treated material with mass standard of the organic fertilizer, if the quality of the product reaches the standard of the organic fertilizer, entering the storehouse for future sell after metering and packaging, and if the quality of the product does not reach the standard, composting after mixed with the city living sludge as the assistant.