The invention relates to the technical field of foods, in particular to a fish food containing sea cucumber and a preparation method thereof, and aims to fill up the market blank of a quick-frozen confected food namely the fish product containing the sea cucumber. The technical scheme is as follows: the fish food comprises the following components in percentage by weight: 2 to 25 percent of sea cucumber, 40 to 70 percent of minced fillet, 5 to 30 percent of flavoring adjuvants and the balance of water. On the basis of keeping the original flavor and taste of the conventional fish food, diced sea cucumber is added into white fish slurry to prepare the fish food, so that purple black particles can be seen on the surface of the fish food, the black-white appearance can increase the appetite of consumers, and special Q crisp taste of the texture of the sea cucumber is added into a springy product to ensure that the taste is more special; and the sea cucumber is a natural food with rich nutrients and healthcare functions, so that the fish food containing the sea cucumber has the functional nutritive characteristic of the sea cucumber, and can meet requirements for healthy nutritional diet of the consumers.