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Food carbon dioxide is an important food additive for carbonated beverages. In the production process of products, the quality is affected by various factors. How to efficiently control product quality in the production process is an important factor in the balance of quality and benefits for enterprises. In view of this situation, the hardware and software scheme of real-time online quality control system is designed. The gas source is switched with a valve, and the gas enters the online analysis instrument after pretreatment. The analyzed data is collected by the lower computer, analyzed and processed by the upper computer software and sent to the distributed control system. Comparing the set value and feedback value, calculating and adjusting the parameters to command and control system to the production and operation of schedules. After the experimental operation, the results show that the system is controlled by PID within the quality setting threshold and Fuzzy-PID compound control over the threshold. The adjustment of process parameters is stable and reliable. When the quality exceeds the set alarm parameters, the system can switch the output flow path in time to prevent unqualified products from flowing into the food storage tank, ensuring the food quality of the product. At the same time, switch the production line and start the regeneration process. Using this system, the on-line quality control and quality traceability of food grade carbon dioxide production can be realized.