NOVELTY - Corollary device comprises a water storage tank, a raw material adjusting tank (2), a heating hydrolysis tank (3), a middle temperature anaerobic digestion reactor (4), a super high temperature forced hydrolysis reactor (5), a high temperature anaerobic digestion reactor (6), a deposition tank and a digestion liquid storage tank, where a digestion liquid outlet on the bottom of the digestion liquid storage tank is connected with a digestion liquid inlet on the top of the raw material adjusting tank by a transmitting pipe. A sludge outlet is connected with a raw material inlet.    USE - The corollary device is useful for producing biogas by city household organic rubbish forced hydrolysis and anaerobic digestion.    ADVANTAGE - The corollary device: has a low cost, easy maintenance, stable and reliable performance, high organic substance removing ratio and raw material gas yield and; thoroughly removes the pathogenic bacteria in the rubbish.    DETAILED DESCRIPTION - Corollary device comprises a water storage tank, a raw material adjusting tank (2), a heating hydrolysis tank (3), a middle temperature anaerobic digestion reactor (4), a super high temperature forced hydrolysis reactor (5), a high temperature anaerobic digestion reactor (6), a deposition tank and a digestion liquid storage tank, where a digestion liquid outlet on the bottom of the digestion liquid storage tank is connected with a digestion liquid inlet on the top of the raw material adjusting tank by a transmitting pipe. A sludge outlet on the bottom of the deposition tank is connected with a raw material inlet of a solid-liquid separator. The digestion liquid outlet of the solid-liquid separator is connected with the digestion liquid inlet on the top of the digestion liquid storage tank and further comprises a digestion residue storage tank for receiving the digestion residues separated by the solid-liquid separator. The raw material adjusting tank is provided with a crusher.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of the corollary device.    Raw material adjusting tank (2)    Heating hydrolysis tank (3)    Middle temperature anaerobic digestion reactor (4)    Super high temperature forced hydrolysis reactor (5)    High temperature anaerobic digestion reactor (6)