Underwater gas chromatography system

The invention provides an underwater gas chromatography system. Comprising a pressure-resistant shell, a water-gas separation sampling module, a carrier gas control module, a sample loading purging module, a chromatographic separation detection module, a waste gas immobilization module, a self-correction module, a state monitoring module and an electric control communication module. The water-gas separation sampling module is installed on an end cover of the pressure-resistant shell in a sealing mode, and the water-gas separation sampling module and the pressure-resistant shell jointly provide an underwater sealing environment for other modules located in the internal instrument cabin. A gas-state component to be detected is automatically collected from environmental water by using a water-gas separation membrane, and the component to be detected is accurately quantified by adopting enrichment-thermal desorption-chromatographic separation-thermal conductivity detector detection. The system is low in gas consu