Urban sludge treatment method

The invention relates to the method for processing urban mud, which belongs to waste water processing field. The method is: pre-heat the mud in heat exchanger, then is mixed with high pressure steam, entering into the reactor; in the reaction course, pure oxygen or no oxygen can be injected into the reactor; after reaction, the mud enters into the heat exchanger and exchange heat with the original mud, the mud cooled is condensed and then enters into the hydroextractor to dehydrate; after dehydration, the much is used as fuel, then is sent into the boiler to burn for generating high pressure steam which is sent back to the entrance of reactor and used for heating mud; mix 4 with 5, which are pumped into UASB, after 6 reaction, the 7 generated is for boiler burning. The invention can reach the purposes of reducing urban mud and making it to be resource.