Problem to be solved: To provide a circulation cooling system for a liquid product containing carbon dioxide capable of avoiding disposal of the liquid product before filling a container after stopping a filling machine due to a trouble or the like. [Solution] a carbonator 2 for dissolving carbon dioxide in a raw material liquid to make a carbonated beverage, a cushion tank 3 for storing the carbonated beverage, a filling machine 4 for filling a container with the carbonated beverage, a circulation flow path C for returning the carbonated beverage to the cushion tank 3, a switching means 5 for switching a liquid feeding destination of the carbonated beverage stored in the cushion tank 3 to either the filling machine 4 or the circulation flow path C, And a cooling device 8 for cooling the carbonic acid beverage circulating in the circulation flow path C. Selected drawing: Figure 3

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