NOVELTY - Method for fermenting sludge, involves introducing dehydrated sludge with high water content into a mixer, mixing with auxiliary materials, crushing to obtain stacking granules, applying material distributor for distributing stacking grains into fermenting case, distributing the materials, ventilating and supplying oxygen for the stacks, heating the stacks, performing fermentation for 8-10 days and then for 10-20 days, thoroughly decomposing and then obtaining the recycled product.    USE - The method is useful for aerobic fermentation of sludge (claimed) such as waste water sludge, sewage sludge and organic industrial waste water.    ADVANTAGE - The sludge is fermented by high temperature aerobic fermentation process at low energy consumption without causing environmental pollution. The granules of sludge are fermented completely, as the diameter of the granules of the stacks is small, stacks are loose and facilitates the air supply and aerobic fermentation. The sludge is fermented cost-effectively at high stability.    DETAILED DESCRIPTION - Low energy consuming pollution free high temperature aerobic fermentation method of sludge, involves (a) directly introducing the dehydrated sludge with high water content ( not greater than 80%) into a mixer and evenly mixing with auxiliary materials, (b) crushing the mixed materials into stacking granules of 20 mm, and controlling the ratio of carbon to nitrogen C/N at 10-20, (c) applying material distributor for distributing the stacking grains into fermenting case of 2 m height, distributing the materials and covering the product obtained from sludge fermentation, (d) ventilating and supplying oxygen for the stacks through ventilating oxygen supplying system in the case, controlling the wind pressure at 0.5 kPa, heating the stacks at above 55 degrees C for one day, maintaining the temperature for not less than 6 days or heating the stacks at 65 degrees C and maintaining the temperature for not less than 4 days, and (e) performing first fermentation for 8-10 days, turning the stacks by a turning device, and then performing second fermentation for 10-20 days, thoroughly decomposing, and then obtaining the recycled product.