The seawater flow ice machine can directly make seawater into an ice water mixture without adding any additives. The moisture content of flowing ice can be adjusted freely between 20% and 60%. Ice water mixtures are mainly composed of tiny ice crystals and water, with ice crystal sizes ranging from 0.25mm to 0.5mm depending on the salt content of seawater. Flowing ice forms a soft slurry that can completely wrap the product and even instantly enter the interior of seafood. It cools down quickly and has a cooling effect that is more than 10 times higher than crushed ice cubes. It has a good preservation effect and can keep the product between -1 ° C and -10 ° C. Moreover, the ice is soft and does not damage the surface of the product. Fish and shrimp themselves live in a seawater environment, and the salt concentration of the flowing ice in seawater is very close to that of the fish body. Therefore, the fish body will not be soaked with salt or water, and the body fluids of the fish will not be released. Flowing ice has good fluidity and is easy to transport and store. All surfaces inside the seawater flow ice machine that come into contact with water are made of food grade materials. Seawater flow ice can also be widely used to preserve other products such as fruits, vegetables, and meat.