The application of fluorescent whitening agent in laundry detergent, fluorescent whitening agent is a color conditioner, with brightening and brightening effect, widely used in paper making, textile, detergent and other fields. There are about 15 basic structural types of fluorescent brighteners and nearly 400 structures. Detergent fluorescent whitening agent is a class of fluorescent whitening agents, at present, China allows the addition of fluorescent whitening agents in clothing detergent there are two types: styrenyl biphenyls (such as CBS, etc.) and bitriazine amino styrenes (such as BLF, BLF, etc.).