The invention discloses a seafood moon cake and a preparation method thereof. The seafood moon cake is prepared from the following raw materials in parts by weight: abalones, sandworms, sleeve-fishes, cuttlefishes, sesame oil, rice meal, flour, oat powder, white granulated sugar, wheat flour, tapioca starch, malt sugar, water, sodium dehydroacetate, sodium propionate, calcium propionate, potassium sorbate, spices and alkaline water. The preparation method comprises the following steps: getting raw materials, pre-processing, weighing, preparing stuffing and wrappers, filling wrappers, forming, roasting, cooling, packaging and obtaining finished products. The seafood moon cake disclosed by the invention has the characteristics that the product is rich in protein and vitamin, and relatively low in fat content; a large number of vitamins are taken to prevent and treat cardiovascular disease, resist ageing and realize nutrition and safety. The processing method is simple, and the finished product is crisp in mouthfeel and convenient to eat.