NOVELTY - Processing municipal sludge comprises concentrating the sludge, heating the concentrated sludge at 45-55 degrees C in a high temperature acid hydrolysis reactor for acid hydrolysis, regulating the pH between 6.5-7.5 at 40-55 degrees C, retaining for 2-5 days to obtain the product of acid hydrolysis, introducing the product into a methanogenic digester, methanogenic digestion at 35-38 degrees C, retaining the products of acid hydrolysis for 10-17 days to generate biogas and digested sludge, desulfurizing the biogas, and dehydrating the digested sludge to generate dehydrated sludge and sludge digestion fluid.    USE - The method is useful for processing municipal sludge.    ADVANTAGE - The method utilizes sludge processing device which is simple and easy to implement.    DETAILED DESCRIPTION - Processing municipal sludge comprises: (i) concentrating the sludge, heating the concentrated sludge at 45-55 degrees C in a high temperature acid hydrolysis reactor for acid hydrolysis, regulating the pH between 6.5-7.5 at 40-55 degrees C, retaining for 2-5 days to obtain the product of acid hydrolysis, (ii) introducing the product into a methanogenic digester at 35-40 degrees C, carrying out methanogenic digestion at 35-38 degrees C, retaining the products of acid hydrolysis for 10-17 days to generate biogas and digested sludge, (iii) desulfurizing the biogas, and (iv) dehydrating the digested sludge to a moisture content less than 60% to generate dehydrated sludge and sludge digestion fluid. An INDEPENDENT CLAIM is also included for a device for processing municipal sludge comprising a methanogenic digester (1) for producing biogas and digested sludge, a dehydrating device (2) for dehydrating the digested sludge, a desulfurization tower for desulfurizing biogas, where the methanogenic digester is provided with a thermostat (4). The device further comprises a high temperature acid hydrolysis reactor (5) for acid hydrolysis of sludge. The high temperature acid hydrolysis reactor is provided with a heater (6) and a heat exchanger for heating the sludge to be processed and cooling the reaction product obtained by acid hydrolysis.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic representation of the device for processing municipal sludge.    Methanogenic digester (1)    Dehydrating device (2)    Thermostat (4)    Acid hydrolysis reactor (5)    Heater. (6)