The invention relates to braised minced fillet snack food and a processing method thereof. The braised minced fillet snack food stored at room temperature is developed by taking minced fillet as main raw material, and adding fish brain marrow through the process of quantitatively mixing, chopping at high speed, carrying out vacuum stirring and vacuum filling, cooking, braising, and sterilizing by radiation. The braised minced fillet snack food has minced fillet content lowest to be 30%, and ice water content up to 30% and has the advantage that the cost can be reduced effectively compared with a product with full minced fillet and high minced fillet content; the fish brain marrow is added, so that the snack food has relatively rich nutrition; compared with a frozen minced fillet seasoning product, the snack food can be stored at room temperature, and is lower in logistics sales cost and convenient to carry. Compared with a minced fillet-sausage product, the snack food has the advantages of being tasty by braising, and having more comprehensive flavor; food-level sodium hydrogen carbonate and calcium chloride are added in the snack food, and the snack food is sterilized by adopting electron beam, so that compared with a product subjected to high-temperature sterilization, the snack food has the advantages of better elasticity, tenderness, chewiness and other textural property indexes.