The online hydrogen quality analyzer can continuously and online measure specific impurities in hydrogen and conduct quantitative analysis. With the internationally advanced gc-ims technology, it can be used in various scenarios such as hydrogen production plants and hydrogen refueling stations. It has the characteristics of simple operation and strong portability. The gas chromatography ion transfer spectrum (gc-ims) technology adopted by the analyzer is a technology that combines chromatography with ion transfer spectrum. At the same time, it takes into account the high selectivity of chromatographic separation and the high sensitivity of ion transfer spectrum, and improves the analysis accuracy to ppb level. Because the polarity of drift voltage can be changed, the analyzer can detect not only halogenated substances, but also aldehydes, alcohols, amines, complex hydrocarbons and other substances.