The invention discloses an aquatic product fresh-keeping method. The aquatic product fresh-keeping method comprises following steps: slaughtering, sterilization, antistaling agent solution dipping, antistaling agent coating, packaging, vacuumizing, and low-temperature storing. According to the aquatic product fresh-keeping method, processes are simple and convenient; antistaling agent solution dipping and antistaling agent solution surface coating are adopted for double fresh-keeping treatment; growth of bacteria in aquatic products is inhibited effectively; fresh-keeping, water retention, and preservative effect are more excellent; the antistaling agent is prepared via combination of a plurality of nontoxic biological fresh-keeping agents, and amino acid and trace element needed by human bodies are added, so that the antistaling agent is high in preservative and fresh-keeping effects, and is safe and reliable; double-layer vacuum package using freshness protection bags and sealing bags are adopted, so that invasion of bacteria and oxygen from outside in fresh-keeping storage processes is avoided, and shelf life is prolonged effectively; and low-temperature storage above 0 DEG C can be realized, and refrigeration is unnecessary, so that meat is not dry or hard, and original mouthfeel and texture of the aquatic products are maintained.