NOVELTY - A wastewater treatment comprises providing cathode material as carbon fiber wire which is fixed by circular ring shape frame with mechanical strength; processing domestication to hanging membrane on surface of cathode, processing domestication on anode, and realizing decarbonization and denitrification in whole process; transmitting cathode rotary shaft by electrode, regulating rotation seed of motor, changing frequency of cathode biological membrane contacting oxygen, and updating speed of biological membrane; interference of oxygen in cathode to anode and inner resistance of reactor.    USE - Method is used for wastewater treatment.    ADVANTAGE - The method controls dissolved oxygen of rotating bio-cathode microbial fuel cell in single-chamber reaction room; reduces inner resistance of battery, quickens updating of biological membrane, and shortens nitrification-denitrification; and synchronously finishes decarbonization and denitrification with low consumption and high efficiency, and extracts chemical energy from pollutant to form electric energy output.    DETAILED DESCRIPTION - Wastewater treatment comprises:    (A) providing cathode material as carbon fiber wire which is fixed by circular ring shape frame with mechanical strength, where carbon fiber wire is connected to outer circuit by middle shaft to communicate with anode;    (B) processing domestication to hanging membrane on surface of cathode, where biological membrane outer layer is aerobic nitrification bacteria for short-distanced nitrification, processing domestication on anode to generate electric bacteria, degrade pollutant and generate electron, and realizing decarbonization and denitrification in whole process to produce electricity;    (C) transmitting cathode rotary shaft by electrode with adjustable rotation speed, regulating rotation seed of motor, changing frequency of cathode biological membrane contacting oxygen, and updating speed of biological membrane; and    (D) regulating distance between cathode and anode, reregulating distance between cathode and anode, and changing interference of oxygen in cathode to anode and inner resistance of reactor.    The inner layer is anaerobic denitrifying bacteria which directly obtains electrode transmitted from anode for denitrification.    DESCRIPTION OF DRAWING(S) - The drawing is a schematic diagram illustrating