NOVELTY - Anaerobic biogas desulfurization device comprises a light compensating lamp (1), a reaction column (2), a biogas inlet pipe (4), a sludge discharging pipe (5), a liquid outlet pipe (6), a gas liquid separator, a biogas flowing pipe, a liquid discharging pipe, a photosynthetic autotrophic bacterial filler, an aerating clapboard and a humidifier. The reaction column is an organic glass reaction column or an inorganic glass reaction column, where the top end of the column is arranged with a biogas inlet. The biogas inlet pipe is installed in the biogas inlet, and provided with the humidifier.    USE - Used as an anaerobic biogas desulfurization device.    ADVANTAGE - The device: exhibits improved desulfurization efficiency by improving light transmission rate after the generation of sulfur particles by the photosynthetic autotrophs during the desulfurization; and is suitable for small-scale biogas desulfurization.    DETAILED DESCRIPTION - Anaerobic biogas desulfurization device comprises: a light compensating lamp (1); a reaction column (2); a biogas inlet pipe (4); a sludge discharging pipe (5); a liquid outlet pipe (6); a gas liquid separator; a biogas flowing pipe; a liquid discharging pipe; a photosynthetic autotrophic bacterial filler, an aerating clapboard; and a humidifier of photosynthetic autotrophs. The reaction column is an organic glass reaction column or an inorganic glass reaction column, where the top end of the reaction column is arranged with a biogas inlet. The biogas inlet pipe is installed in the biogas inlet, and provided with the humidifier. The lower part of the reaction column is arranged with a discharging sludge, where one end of a sludge discharging pipe passes trough the discharging sludge, which is installed in the reaction column, and is extended to the bottom of the reaction column. The other end of the sludge discharging pipe is installed out of the reaction column. The lower part of the reaction column is a liquid section, and is arranged with a liquid outlet, where one end of the liquid outlet pipe is installed in the liquid outlet, and the other end of the liquid outlet pipe is connected with the gas liquid separator. The upper end of the gas liquid separator is connected with the biogas flowing pipe, and the lower end of the gas liquid separator is connected with the liquid discharging pipe. The aerating clapboard is installed in the reaction column and above the liquid outlet pipe. The reaction column is provided with the photosynthetic autotrophic bacterial filler on the aerating clapboard. The light compensating lamp is installed out of the reaction column, where the distance between the light compensating lamp and the reaction column is 50-60 mm. An INDEPENDENT CLAIM is also included for desulfurizing biogas anaerobically by the device, comprising humidifying and spraying biogas from the biogas inlet pipe into the reaction column to form a downstream flow and bind with the photosynthetic autotrophic bacterial filler, where the photosynthetic autotrophs synthesize cellular material with carbon dioxide, and transform sulfur ion into monomeric sulfur and release it out of the cell, separating monomeric sulfur from the photosynthetic autotrophic bacterial filler by the downstream flow, gradually depositing at the bottom of the reaction column and discharging out of the reaction column through the sludge discharging pipe, flowing biogas liquid at the bottom of the reaction column to remove carbon dioxide and hydrogen sulfide, flowing out of the liquid outlet pipe, separating by the gas liquid separator, discharging the processed biogas by the biogas flowing pipe, where the light compensating lamp provides light source for the growth of the photosynthetic autotrophs during the reaction of the reaction column.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic representation of the anaerobic biogas desulfurization device.    Light compensating lamp (1)    Reaction column (2)    Biogas inlet pipe (4)    Sludge discharging pipe (5)    Liquid outlet pipe (6)