NOVELTY - A sludge and household garbage processing device comprises an internal circulation sludge concentration-digestion reactor including outer and inner bins, and a household garbage bin surrounding the reactor. The lower part of outer bin has sludge inlet pipe connected with high-position sludge distribution tank, while the upper part has three-phase separator. Gas produced by outer bin goes into a gas-liquid separator connected to a gas collecting tank. The bottom part of inner bin is a sludge concentrating region. The garbage bin has an aeration pipe connected with the gas collecting tank.    USE - Sludge and household garbage processing device used in urban sewage treatment plant.    ADVANTAGE - The device reduces energy consumption of sludge and garbage processing. The processed sludge has good dehydration property and reduced organic material content.    DETAILED DESCRIPTION - A sludge and household garbage processing device comprises an internal circulation sludge concentration-digestion reactor including sludge outer and inner bins; and a household garbage bin surrounding the sludge concentration-digestion reactor. The sludge outer bin is formed by a space between outer and inner shells of reactor. The sludge inner bin is located at the center of reactor and is formed by a space surrounded by inner shell. The lower part of outer bin shrinks until its diameter is the same as the inner bin, is connected with the lower part of inner bin, and has a sludge inlet pipe connected with a high-position sludge distribution tank. A through-hole for passage of water and sludge is arranged between bottom part of outer bin and inner bin. The top part of outer bin has water outlet weir and water drainage pipe. The upper part of outer bin has a three-phase separator. The gas produced by outer bin goes into a gas-liquid separator through an air vent. The top part of gas-liquid separator is connected with a methane pipe which is connected with a gas collecting tank after passing through a gas washing bottle, while the bottom part of gas-liquid separator is connected with an internal circulation pipe which stretches downwards to the lower part of inner bin and is divided into upper and lower sections. The lower end pipe wall of upper section and the upper end pipe wall of lower section are respectively provided with through-holes for passage of water or water and gas. The bottom part at lower end of internal circulation pipe is connected with a gas backflow pipe which is connected with a gas collecting tank having a circulation pump. The bottom part of inner bin is a hopper-shaped sludge concentrating region provided with a sludge discharging pipe at bottom part. The upper part of garbage bin has a garbage feeding port, while the lower part has a garbage discharging port. The garbage bin has an aeration pipe connected with the gas collecting tank and stretching from upper part to the bottom of garbage bin. The upper, middle and lower parts of outer and inner bins are respectively connected with sampling ports. An INDEPENDENT CLAIM is included for processing sludge and household garbage in urban sewage treatment plant by feeding sludge into high-position sludge distribution tank through manual or pump suction manner; feeding sludge into sludge outer bin by gravity in intermittent manner; performing gravity concentration and primary sludge-water separation; feeding precipitated sludge into sludge inner bin; performing concentration and digestion treatment; separating steam water and mud water through three-phase separator; discharging digested sludge from sludge discharging pipe; feeding methane into gas washing bottle and into gas collecting tank after gas washing; pumping methane into internal circulation pipe; overflowing backflow methane into sludge inner bin through water and gas passage through-holes; stirring the sludge at lower part of inner bin under the circulation driving of backflow methane, so that methane produced at lower part of inner bin raises to drive the mixed liquid at middle and upper parts of inner bin to be lifted to the gas-liquid separator; feeding separated methane into gas collecting tank through methane pipe; flowing mixed liquid back along the upper section of internal circulation pipe to the middle part of inner bin to finish gas stirring process; filling garbage in garbage bin outside the outer bin to ferment the garbage to generate hot gas; transmitting part of heat to sludge processing bin for digesting sludge through the wall of outer bin; using other part of heat to maintain temperature in the garbage bin; supplying air to the garbage bin; and collecting waste gas and further processing waste gas.