In order to realize the reasonable classification of optical spectrometers, the classification study is carried out from the working band and spectroscope of the spectrometer. On the basis of in-depth research on the development status of existing spectrometer products at home and abroad, the related research is summarized and analyzed, and the specific classification methods and classification results are given. At the same time, by using known spectrometry technology and the research result, the comparative research conclusions of spectrometers are introduced, and the key technologies and core components are pointed out. This conclusion can provide spectrometer researchers with a panoramic viewing angle and also provide a valuable reference for tracking industry development.