The invention consists of the invention the anaerobic digester to achieve the anaerobic digestion tank, and technical problems, such relates to a bio-gas producing device using the same, and more particularly, the above for the production of biogas from organic mixtures, such as food waste is , Joe accommodated with a space to accommodate the mixture within the digester; A stirrer for stirring a mixture in the receiving tank accommodated digester; Injection hole for injecting the organic mixture into the receiving tank; The receiving tank after discharging a mixture of anaerobic digestion is performed inside the digestion and regular outlet with a filtration unit; A conveying path having at least two inlets and at least one outlet is formed so as to circulate to the upper portion from the receiving section receives a set of mixtures received within the digester bottom, so as to have a different height in the receiving tank side wall; A number of injection nozzles which is connected to the outlet of the jet to transport the mixture to the digester through a transfer to the transport dogs formed injection pipe; Gas discharge port for discharging the biogas generated by the anaerobic digestion of the mixture within the digester tank to accommodate the outside; It including characterized in that configuration.