NOVELTY - Treating sludge of urban sewage in a treatment plant by controlled composting method, comprises: (a) producing organic fertilizer material; (b) mixing sludge with the organic fertilizer and completely agitating; (c) aerating the obtained high temperature compost fertilizer, composting it for 15-20 days, and dewatering it; (d) screening the obtained composted, dewatered organic fertilizer primary product and placing it in shade, aerating and drying it, and stabilizing it, and packaging the obtained organic fertilizer finished product, to form fertilizer product.    USE - The method is useful for treating sludge of urban sewage in a treatment plant by controlled composting method.    DETAILED DESCRIPTION - Treating sludge of urban sewage in a treatment plant by controlled composting method, comprises: (a) producing organic fertilizer material by crushing the organic waste into particles having a particle size of 1-2 cm; (b) adding sludge having a water content of 75-80%, a high content of organic matter per ton of the sludge, and without the heavy metals, into an existing agitator at normal temperature, mixing the sludge with the organic fertilizer material in a ratio of 1:1, and completely agitating the mixture to form a high temperature compost fertilizer; (c) placing the high temperature compost fertilizer for aeration under a rain shelter for processing, controlling the internal temperature of the high temperature compost fertilizer by an air blower during high temperature composting process, suddenly increasing the internal temperature to 75 degrees C and subjecting the organic matter for quick fermentation, composting the fertilizer for 15-20 days, and dewatering the fertilizer to a water content of 15-20% per ton, to form organic fertilizer primary product; (d) screening the composted, dewatered organic fertilizer primary product, and screening the organic fertilizer material, which is not composted into a powder, placing the remaining powder of organic fertilizer primary product in shade, aerating and drying it, and stabilizing it for 10-15 days at normal temperature to form organic fertilizer finished product, and packaging the organic fertilizer finished product, to form fertilizer product.