The present invention discloses a method and a device for preserving sea food material. The method of the present invention comprises: placing sea food material into a first container； injecting low-temperature seawater with a temperature below 0 DEG C and above the ice point of seawater into the first container, and then sealing the first container； placing the first container in which the sea food material and the low-temperature seawater are placed into a heat-insulating container； and filling the heat-insulating container with ice cubes, and then sealing the heat-insulating container. In the present invention, the low-temperature seawater that remains in a liquid state below 0 DEG C and the ice cubes are cooperatively provided to extend the refrigerating time of the sea food material in the liquid seawater of 0 DEG C, which prolongs the freshness preservation of the sea food material, allows the sea food material to be stored just like in a seawater storage environment with a temperature below 0 DEG C, thereby causing no damages to its tissues, keeping the nutritional ingredients, sweetness and meat elasticity, as well as realizing an effect of newly caught sea food material.本發明揭露了一種海鮮食材的保存方法及保存裝置，本發明方法包括：將海鮮食材置入一第一容器；在第一容器中注入0℃以下且在海水冰點以上的低溫海水然後密封第一容器；將內置有海鮮食材和低溫海水的第一容器置入一隔熱容器；以及在所述隔熱容器中填充冰塊然後密封隔熱容器；本發明利用0℃以下維持液態的低溫海水和冰塊協同提供並延長海鮮食材於0℃液態海水中的冷藏時間，可以延長海鮮食材保鮮能力，讓海鮮食材就像存放在0℃以下海水中的儲存環境，不會破壞其組織，並保持其營養成份、鮮甜度和肉質彈性等，以及實現海鮮食材如同現撈的效果。
