NOVELTY - The continuously operating device for improved gas yield by digestion of biomass in biogas plant, comprises a separator (1) arranged for a fluid substrate of organic biomass transferred with solid material and connected with a container (3) for the fluid substrate and also with an extruder (2) for swollen solid material from the organic biomass. The effect of cavitation and implosion of the cells of the swollen solid material is greater than the biomass not swelled by the cells as initial material for the biogas plant through pressure and temperature.    USE - Continuously operating device for improved gas yield by digestion of biomass in biogas plant.    ADVANTAGE - The device ensures rapid production of biogas with improved yield by effective destruction of cell structures.    DETAILED DESCRIPTION - The continuously operating device for improved gas yield by digestion of biomass in biogas plant, comprises a separator (1) arranged for a fluid substrate of organic biomass transferred with solid material and connected with a container (3) for the fluid substrate and also with an extruder (2) for swollen solid material from the organic biomass. The effect of cavitation and implosion of the cells of the swollen solid material is greater than the biomass not swelled by the cells as initial material for the biogas plant through pressure and temperature and/or subsequently strong reduction of the volume tension of the swollen solid materials. The extruder is connected with the container. The device is arranged below a fermenter and/or a post-fermenter. The dry substance content of the swollen solid materials of the organic biomass below the separator to the extruder is greater than 20%. An agitator is arranged in the container for the fluid and solid phase of the organic biomass. A conveyor is coupled on the container for the mixture contained in the container to the separator and the extruder.    DESCRIPTION OF DRAWING(S) - The figure shows a device for improved gas yield.    Separator (1)    Extruder (2)    Container. (3)