The invention discloses a seafood chilli sauce and a preparation method thereof. The seafood chilli sauce is prepared from the following raw materials: dried shrimps, oyster flavor powder, oyster sauce, abalone powder, black fungus, konjaku flour, fresh red pepper, soybean protein powder, tremella aurantialba, fresh mint leaf, cassia nomame seed, peach gum, passion fruit, brown rice, chilli powder, garlic powder, star aniseed powder, cooked white sesame seed, schisandra chinensis, coat of hyacinth bean, stevia rebaudian and honeysuckle stem. The seafood chilli sauce has the beneficial effects that the seafood chilli sauce disclosed by the invention is a pure natural green food, is fresh and delicious, and is moderate in sweetness and salinity; meanwhile, a plurality of food materials are compositely matched with one another, so that the nutrient is relatively comprehensive and balanced; and the seafood chilli sauce is suitable for daily cooking, and is good in freshness-raising effect, and food cooked with the seafood chilli sauce is excellent in color, aroma and taste.