Problem to be solved: To provide a system for maintaining the freshness of raw laver algae, which can reliably maintain the freshness of raw laver without causing an increase in the cost of equipment and can improve the quality (commercial value) of dried laver. Solution: A system 1 for maintaining the freshness of raw laver algae is used to maintain the freshness of raw laver algae in the production of dried laver. The system 1 for maintaining the freshness includes: A stirring tank 2 having a substantially rectangular parallelepiped shape for storing and stirring the raw laver algae together with sea water; and a control unit 3 for dissolving oxygen in the waste water (sea water) discharged from the raw laver-raw algae pretreatment unit 3 at a predetermined pressure, A gas-liquid mixing device 4 for obtaining sea water containing high concentration dissolved oxygen, and sea water feeding means 5 for...

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