NOVELTY - Producing biogas by enhanced hydrolysis and anaerobic digestion of organic garbage, by adding water or digestive liquid to regulate solid concentration of crushed raw material in regulating pool, passing regulated raw material to heating hydrolysis pool, pumping heated raw material to moderate temperature anaerobic digestion reactor for anaerobic digestion and then to high temperature enhanced hydrolysis reactor and passing raw material to sedimentation basin and passing digestive liquid at upper portion of sedimentation basin in digestive liquid storage pool.    USE - The method is useful for producing biogas.    ADVANTAGE - The method is simple, organic matter removal rate is high, and produces biogas in large amounts, and completely removes bacteria from garbage.    DETAILED DESCRIPTION - Method for producing biogas by enhanced hydrolysis and anaerobic digestion of urban household organic garbage, involves (a) reducing the urban household organic garbage until the particle diameter is 1 cm or less, (b) placing the crushed raw material in a raw material regulating pool, adding water or digestive liquid to regulate the solid concentration of the raw material and controlling the solid concentration of the raw material at 15%, (c) passing the raw material in which the solid concentration is regulated to a heating hydrolysis pool to pre-heat the raw material, controlling the temperature in the pool at 30-38 degrees C and maintaining the raw material in the heating hydrolysis pool for 1-2 days, (d) pumping the heated raw material into a middle temperature anaerobic digestion reactor to carry out middle temperature anaerobic digestion for 0.5-6 hours at 70-100 degrees C, (e) passing the raw material to a high temperature enhanced hydrolysis reactor, after enhanced hydrolysis, passing the raw material to a high temperature anaerobic digestion for 5-10 days at 50-56 degrees C, controlling the pH at 6.5-7.8 and after finishing high temperature anaerobic digestion, passing the raw material to a sedimentation basin for 1-2 days at normal temperature, and passing the digestive liquid at the upper portion of the sedimentation basin to a digestive liquid storage pool.