Under the water-based 3C2B spraying process,the intermediate coating and color coating robots need to frequently call the set cleaning program during the spraying process,resulting in a large amount of water-based hazardous waste and high cost of hazardous waste treatment.By introducing membrane separation process equipment based on concentration detection technology,the water-based waste liquid discharged from robot cleaning was treated,so that the recovery,reuse,and emission reduction of solvents and water were achieved.