NOVELTY - A biological gas circulating electromagnetic anaerobic membrane bioreactor comprises a reaction tank (1) that is separated into a main reaction zone (13) and a membrane separation zone (14). The main reaction zone and the membrane separation zone are connected with each other at the bottom of the reaction tank.    USE - Bioreactor for wastewater treatment.    ADVANTAGE - The bioreactor can reduce membrane pollution, extend the service life of the membrane, and strengthen the processing capacity of the anaerobic membrane bioreactor on toxic difficult degradation of pollutants.    DETAILED DESCRIPTION - A biological gas circulating electromagnetic anaerobic membrane bioreactor comprises a reaction tank (1). The top of the reaction tank is separated into a main reaction zone (13) and a membrane separation zone (14). The main reaction zone and the membrane separation zone are connected with each other at the bottom of the reaction tank. The top inside the reaction tank is provided with a biogas air-gathering zone. The reaction tank is added with magnetic biological carrier (4). The top of the main reaction zone is provided with two electrode plates (2). The electrode plate is connected with a direct-current power supply outside of the reaction tank. The lower part of the main reaction zone is provided with two vertical guide plates. The upper part of the membrane separation zone is provided with a group of membrane components. Below the membrane is provided with a membrane washing device. The outside top of the reaction tank is provided with a biogas recycle system. One end of the biogas recycle system is connected with the biogas air-gathering zone of the reaction tank, one end is connected with the membrane washing device. The bottom of the reaction tank is provided with a funnel type sludge bucket. The bottom center of the sludge bucket is below the center of the guide plate, and a wastewater distribution system is provided. The water inlet of the wastewater distribution system is connected with the wastewater pipeline, and connected to the water outlet of the wastewater recycle system through the pipeline, the water inlet of the wastewater recycle system is connected to the main reaction zone top of the reaction tank through the pipeline. The wastewater is discharged from the reaction tank after filtered by the membrane component.    DESCRIPTION OF DRAWING(S) - The drawing is a sectional view of the bioreactor.    Reaction tank (1)    Electrode plates (2)    Magnetic biological carrier (4)    Main reaction zone (13)    Membrane separation zone (14)