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This utility model provides a closed-loop sampling system for a vinyl chloride converter, relating to the field of vinyl chloride sampling technology. The closed-loop sampling system includes a converter with a sampling ball valve at its outlet; an analysis unit including an injection valve, an online analytical chromatograph, and an outlet valve; and connecting pipelines including an injection pipeline, an air pipeline, a nitrogen pipeline, a standard gas pipeline, and an outlet pipeline. The two ends of the injection pipeline are connected to the outlet of the sampling ball valve and the inlet of the injection valve, respectively. The air, nitrogen, and standard gas pipelines are connected to the injection pipeline, and the outlet pipeline is connected to the outlet valve. This system enables automatic sampling and analysis, reducing the time required for material analysis, improving the accuracy and timeliness of analytical data, and achieving precise control of the reaction in a single converter.