NOVELTY - Aerobic composting of sludge in sewage treatment plants comprises adding an expanding agent with paddy shell or wheat straw in the sludge to reduce the water content to be lower than 50% uniformly mixing, transporting the mixture to a vertical fermenting chamber, and simultaneously spraying fermenting bacteria for prompting the aerobic fermentation, carrying out stack-turning treatment on the stacked materials to mix the composting materials, and increasing the stack layer aperture to help the smooth oxygen supply, and transporting and processing the well fermented materials.    USE - The method is useful for aerobic composting of sludge in sewage treatment plants (claimed).    ADVANTAGE - The method performs degradation of dehydrated sludge by organic substances, and carries out curing and disinfection treatment, so as to fulfill the purposes of harmless, capacity reduction, stabilization and recycling of organic sludge.    DETAILED DESCRIPTION - Aerobic composting of sludge in sewage treatment plants comprises (i) adding an expanding agent with paddy shell or wheat straw in the sludge to reduce the water content to be lower than 50% and enable the carbon/nitrogen (C/N) to be up to 30:1, uniformly mixing to be soft and shaped into loose soil material, placing on the special cloth conveyor by bucket elevator, transporting the mixture to a vertical fermenting chamber, and simultaneously spraying fermenting bacteria for prompting the aerobic fermentation, (ii) carrying out stack-turning treatment on the stacked materials by a stack turning machine to mix the composting materials to be more uniform, and simultaneously increasing the stack layer aperture to help the smooth oxygen supply, where the organic matter can be fully degraded, and promoting the dehydrated sludge fermentation period to be greatly shortened, and (iii) transporting and processing the well fermented materials by a discharging transporter, where rough-processing can be performed to produce an organic powdered fertilizer, and fine-processing can also be performed to produce an organic fertilizer.