NOVELTY - The anaerobic reactor device comprises an anaerobic reactor body connected with a biogas collecting main pipe, which is connected with a three-phase separator. The separator is arranged at a lower part of a base. An outlet end of the biogas collecting main pipe is provided with a marsh gas collecting main pipe control valve. A front end of the washing water pipe is connected with the anaerobic reactor tank body. The washing water pipe is provided with a control valve. Another end of the biogas collecting main pipe is connected with a bottom part of a drainage pipe along vertical direction.    USE - The anaerobic reactor device is useful for removing dross (claimed).    ADVANTAGE - The anaerobic reactor device effectively removes dross, and avoids blockage of marsh gas collecting pipeline.    DETAILED DESCRIPTION - The anaerobic reactor device comprises an anaerobic reactor body connected with a biogas collecting main pipe, which is connected with a three-phase separator. The separator is arranged at a lower part of a base. An outlet end of the biogas collecting main pipe is provided with a marsh gas collecting main pipe control valve. A front end of the washing water pipe is connected with the anaerobic reactor tank body. The washing water pipe is provided with a control valve. Another end of the biogas collecting main pipe is connected with a bottom part of a drainage pipe along vertical direction. The biogas collecting main pipe and the drainage pipe are connected with a U-shaped pipe. The drainage pipe is provided with a drainage exhaust pipe. The drainage exhaust pipe is connected to the bottom part of the tank body extended along downwards in parallel. The drainage exhaust pipe is provided with a drainage control valve. A top part of the produce washing water pipe is provided with a washing water production pipe control valve. A check valve is arranged between the washing water production pipe control valve and the biogas collecting main pipe. The biogas collecting main pipe is connected to a lower part of the three-phase separator. An INDEPENDENT CLAIM is included for removing dross using an anaerobic reactor device.