The invention is applicable to the technical field of spectrometers, and provides a spectrometer and a controller thereof. According to the embodiment, the controller applied to the spectrometer comprises a processor, a light source driving circuit, a data processing circuit and a display screen driving circuit arranged in an integrated manner, the structure is compact, a touch control instructionis input through a touch display screen, and the controller controls a light source, a spectrum detector and the touch display screen according to the touch control instruction so that spectrum datadetection of samples is realized, and the intelligence degree is high.