Online component detection technology can effectively solve the lag problem of traditional chemical analysis methods. It is a key step to realize the intelligent control of components. Based on the introduction of principles, advantages, application cases and existing problems on such three kinds of online component detection technologies, as prompt gamma - ray neutron activation analysis, laser - induced breakdown spectroscopy and near - infrared spectroscopy, the feasibility and development tendency of the technology application in iron ore sintering are expounded, which is expected to provide a certain reference for the intelligent control and stable production of iron and steel enterprises.