The invention discloses a canned olive oil fermented soybean dace and a preparation method thereof. The canned olive oil fermented soybean dace comprises 50-55wt% of dried cooked dace which has been soaked in a liquid seasoning, 20-30wt% of olive oil and 15-20wt% of low-sodium fermented soybeans; the liquid seasoning comprises spice soup, light soy sauce, white granulated sugars, monosodium glutamate, scallop powders, yeast extracts and water-soluble ginger powders. The preparation method comprises the following steps of 1) preparing the liquid seasoning; 2) pretreating the low-sodium fermented soybeans; 3) seasoning and canning the dried dace; 4) sterilizing. The canned olive oil fermented soybean dace is fresh and sweet in taste, moderate in salty flavor, basically free of fishy smell, low in oil content, rich in nutritional value, simple in preparation process and easy to realize mass production.