Online chromatographic analysis device

The invention relates to an online chromatographic analysis device, which mainly solves the problem of difficult simultaneous analysis of a mixture of hydrogen/permanent gases, non-aromatic hydrocarbon and aromatic hydrocarbon in the process of analyzing an aqueous reaction system and solves the water interference problem during analysis in the conventional chromatographic analysis technology. By adopting two serially connected quantitative tubes 5 and 7 for sampling simultaneously, a sample acquired by the quantitative tube 5 switches light components with the carbon atom number less than 5 and water to a damping column 15 and an analytical column 16, while the components with the carbon atom number greater than 5 are all switched to a damping column 17 and an analytical column 18 and are all detected by a hydrogen ionized flame detector 22 after separation. A sample acquired by the quantitative tube 7 blows back the water and components with the carbon atom number of 2 and more than 2, while the hydrogen, methane and other permanent gases enter an analytical column 12 for separation and are detected by a thermal conductivity detector 21. Therefore, the online chromatographic analysis device well solves the problem of the simultaneous analysis of the mixture of hydrogen/permanent gases, non-aromatic hydrocarbon and aromatic hydrocarbon and the water interference problem during analysis, and can be used for online chromatographic analysis of the aqueous mixture of hydrogen/permanent gases, non-aromatic hydrocarbon and aromatic hydrocarbon.