NOVELTY - Processing sewage sludge comprises e.g. performing sewage sludge conditioning by performing chemical method by removing water content from sludge, adding carbonitride, adding chitosan and calcium hydroxide into sludge, placing conditioned sewage sludge into a completely mixed anaerobic digestion tank, mixing and regulating mixed anaerobic digestion tank, removing methane-containing biogas by dehydrating, performing desulfurization, decarbonization and solid-liquid separation, isolating water content, and performing biological oxidation, biogas carbonization and anaerobic anoxic reaction.    USE - The method is useful for processing sewage sludge (claimed).    DETAILED DESCRIPTION - Processing sewage sludge comprises carrying out sewage sludge conditioning by performing physical methods first and then chemical methods or chemical methods first and then physical methods, where chemical method is carried out by removing 93-95% water content from sludge, adding carbonitride into sludge in ratio of 12-18, maintaining pH to 6.7-7.4, adding 15-90 mg/l chitosan and 30-120 mg/l calcium hydroxide or adding 30-80 mg/l chitosan, 30-120 mg/l calcium hydroxide and 2-8 mg/l polyacrylamide into sludge, so as to maintain pH of the sludge to 6.7-7.4; (ii) placing step (i) conditioned sewage sludge into a completely mixed anaerobic digestion tank, carrying out anaerobic digestion at 38-40oC, uniformly mixing and regulating the mixed anaerobic digestion tank at temperature difference of plus minus 0.5 degrees C, mixing sewage sludge anaerobic digestion, uniformly mixing by pneumatic stirring, or uniformly stirring the sludge by intermittent stirring using an intermittent stirring machine in a mixed anaerobic digestion tank, carrying out anaerobic digestion by pneumatic stirring for 16-19 days, to obtain 62-68% methane-containing biogas, removing 62-68% methane-containing biogas by a dehydrating, carrying out desulfurization and decarbonization processes to collect gas in cans, where anaerobic digestion is carried out by pneumatic stirring using intermittent stirring machine at a speed of 15-55 rotations/minute; (iii) carrying out solid-liquid separation of step (ii) anaerobic digestion liquid using a rotary flow reactor, isolating 55-85% water content from the residue, separating slurry used as raw materials of organic fertilizer, and carrying out biological oxidation treatment; (iv) carrying out biogas carbonization process by mixing sawdust or waste paper with step (iii) 55-85% water content in a mass ratio of 1:22, mixing 28% biogas residues with the above water content in a mass ratio of 1:5-15, then placing 22-28% of water content having biogas residues in a heat converter carbonization plant having high temperature and high pressure, carrying out anaerobic anoxic reaction for 18-25 minutes, to obtain carbonization gas and biological sewage sludge generated carbon, where the carbonized gas is directly transported by a pipeline into an combustion chamber having high temperature and high pressure continues to burn, and provides heat during carbonizing reaction at 650-750 degrees C under pressure of 16.5-18.5 Mpa.