NOVELTY - Zero-energy dephosphorization processing method of municipal sewage comprises introducing preprocessed sludge and refluxed sludge from settled pond into anaerobic pond; processing clean sewage as water exhaustion system and 3-class sewage process and exhausting sludge from settled pond; digesting concentrated sludge exhausted to anaerobic sludge digestion unit, where water removed sludge (supernatant) is refluxed to sewage pre-process; and digesting sludge in anaerobic condition in anaerobic sludge digestion unit and generating methane gas and digested sludge with methane as main part.    USE - Zero-energy dephosphorization processing method of municipal sewage.    ADVANTAGE - The integrated use of sludge anaerobic digestion, and sewage anaerobism and aerobic organism dephosphorization processing technology greatly increases output of methane. The recycle of methane gas energy can supply the energy for sewage and sludge process.    DETAILED DESCRIPTION - Zero-energy dephosphorization processing method of municipal sewage comprises:    (A) introducing preprocessed sludge and refluxed sludge from settled pond into anaerobic pond, where part or whole of digested sludge refluxed back from anaerobic sludge digestion unit enters anaerobic pond, and stirring sludge and sewage or aerating to form mixture A;    (B) introducing mixture A into aerobic aeration pond by anaerobic pond, where part or whole of the digested sludge refluxed by anaerobic sludge digestion unit enters aerobic aeration pond and introducing mixture B from aerobic aeration pond into settled pond;    (C) processing clean sewage as water exhaustion system and 3-class sewage process with mixture B, exhausting sludge from settled pond, where large part of sludge as reflux sludge enters anaerobic pond, and exhausting residual sludge to sludge concentrating unit;    (D) digesting concentrated sludge exhausted to anaerobic sludge digestion unit, where water removed sludge (supernatant) is refluxed to sewage pre-process;    (E) digesting sludge in anaerobic condition in anaerobic sludge digestion unit, generating methane gas and digested sludge with methane as main part, where one part of digested sludge is refluxed to anaerobic pond or aerobic aeration pond in exhausted sludge of sludge digestion unit; or    (F) refluxing to anaerobic pond or aerobic aeration pond according to proportion, where other part of digested sludge dewatered and processed according to domestic standard.