The work aims to summarize the research progress on application of slightly acidic electrolyzed water (SAEW) in preservation and processing of aquatic products to provide theoretical reference for subsequent research. On the basis of introducing the preparation principle and action mechanism of SAEW, the application and the research progress of this technology in preservation and processing of aquatic products were introduced. The existing problems and solutions were put forward. The results showed that SAEW treatment can inhibit the growth of microorganisms, delay the rise of pH value, improve water retention, maintain product color, and enhance texture characteristics. However, with the continuous improvement of consumers' requirements for the quality of aquatic products, the use of SAEW treatment in aquatic products was not the most ideal method. It could be combined with other physicochemical and bio-preservation technologies to improve its comprehensive effect. Therefore, SAEW shows certain advantages in preservation and processing of aquatic products, and can be combined with other treatment methods to enhance the processing efficiency of SAEW in sterilization and preservation.