NOVELTY - Aerobic cometabolism lignite wastewater treatment method involves selecting lignite wastewater, placing in precipitation pool, adding demulsifiers and flocculants, coagulating, delivering into the anaerobic reactor by peristaltic pump for anaerobic hydrolysis acidification, taking trehalose as cometabolism first matrix and municipal wastewater treatment plant sedimentation tank sludge as inoculating sludge, starting up aerobic reactor, adding trehalose by trehalose automatic dosing control system, controlling trehalose dosage and comparing trehalose dosage and chemical oxygen demand values.    USE - Method for carrying out aerobic cometabolism lignite wastewater treatment (claimed).    ADVANTAGE - The method has chemical oxygen demand removal rate of 85% and total phenol removal rate of 80%.    DETAILED DESCRIPTION - Aerobic cometabolism lignite wastewater treatment method comprises selecting lignite wastewater with chemical oxygen demand concentration of 950-l200 mg/L, biochemical oxygen demand concentration of 350-400 mg/L, total phenol concentration of 70-90 mg/L, ammonia concentration of 55-70 mg/L and total phosphorus concentration of 3-5 mg/L, placing in precipitation pool, adding demulsifiers and flocculants, coagulating, delivering into the anaerobic reactor by peristaltic pump for anaerobic hydrolysis acidification with chemical oxygen demand volume load of 0.95-1.6 kg/(m3.d), hydraulic retention time of 18-24 hours and filling rate of 80%, taking trehalose as cometabolism first matrix and municipal wastewater treatment plant sedimentation tank sludge as inoculating sludge, starting up aerobic reactor where inoculation sludge dosage is 4-6 g/L, adding trehalose by trehalose automatic dosing control system, installing chemical oxygen demand on-line measuring instrument equipped with programmable logic controller, solenoid valves and metering pumps into anaerobic reactor, controlling trehalose dosage, calculating chemical oxygen demand value of trehalose, converting into digital signal, entering input to programmable logic controller, comparing trehalose dosage and chemical oxygen demand values using the proportional-integral-derivative algorithm and setting trehalose dosage/chemical oxygen demand value to 0.5-1.0.