NOVELTY - An innocuity treatment for sludge with oil, involves mixing the sludge with oil to form liquid sludge, aerobic fermenting the sludge using microorganism strain, adding nutritional drug with fertilizer and supplying air to fermentation chamber, obtaining biological sludge by converting petroleum type matter and other organic matter to carbon dioxide, water and micro-organism by metabolism, spin drying the biological sludge to obtain pastry solid biological sludge, fermenting the biological sludge by piling in a field to convert the sludge to organic fertilizer.    USE - The organic fertilizer is useful for improving soil and gardening virescence or crops fertilization (claimed).    ADVANTAGE - The innocuity treatment of sludge with oil is simple, inexpensive and dehydration cost of the sludge is less.    DETAILED DESCRIPTION - An innocuity treatment for sludge with oil, involves collecting the sludge with oil, mixing the sludge with oil through mixed isotropic process to form liquid sludge with oil with stable physical and chemical properties, oxidizing the sludge with oil by aerobic fermentation process at 20-80 degrees C for 20-80 hours, absorbing and degrading the organic matter present in the sludge with oil by adding microorganism strain, analyzing the organic matter content, dissolved oxygen, ammonia nitrogen and phosphorus content in sludge, adding nutritional drug with nitrogenous fertilizer and phosphate fertilizer to fermentation chamber, supplying air to reacting process to control the amount of dissolved oxygen in the sludge with oil to 1-15mg/L, obtaining biological sludge by converting petroleum type matter in the sludge and the other organic matter to carbon dioxide, water and micro-organism by metabolism, during fermentation, spin drying the biological sludge to dehydrate and condense the sludge with a water content more than 90% to obtain pastry solid biological sludge, with oil less than 70-80%, adding plant dross to the solid biological sludge to control the sludge water content of the added plant dross to 50-60%, adding and mixing biological agent to sludge (2-5 kilogram/ton), fermenting the biological sludge at a high temperature by piling in the fertilizer piled field to increase hydrophilicity of the biological sludge and plant nutritional content and covering the pile with plastic film or sealing using mucosity mud, to convert the sludge to organic fertilizer.