The invention discloses a flavor chilli sauce containing beef dices and its preparation method, and relates to a seasoning. The flavor chilli sauce containing beef dices comprises the following raw materials, by weight, 100-150 parts of dry red chilli, 10-15 parts of peanut oil, 5-10 parts of sesame oil, 80-100 parts of rapeseed oil, 15-20 parts of a beef dice, 5-10 parts of crushed peanut, 3-5 parts of diced dried tofu, 3-5 parts of salt, 1-2 parts of sesame, 2-3 parts of five spice powder, 3-5 parts of rock sugar, 4-6 parts of Chinese prickly ash powder, 0.2-0.6 parts of Fructus Tsaoko, 0.2-0.6 parts of cumin, 0.1-0.2 parts of clove, and 3-5 parts of a dark soy sauce. The preparation method of the flavor chilli sauce containing beef dices comprises the following steps: 1, preparing the raw materials; 2, chilli boiling: boiling the dry and red chilli with boiled water for 4-6min, and taking out the boiled chilli; 3, mashing the chilli to form a chilli sauce; and 4, oil frying: frying beef dices and the diced dried tofu with the rapeseed oil, frying the crushed peanut, taking out, frying the chilli sauce with the rapeseed oil, adding the crushed peanut, salt, the rock sugar, the five spice powder , the Fructus Tsaoko, cumin, clove and the dark soy sauce, continuously frying, adding the sesame oil, the peanut oil, the beef dices, the diced dried tofu, sesames and the Chinese prickly ash powder, frying for 20-30s, cooling, and filling to a bottle. The flavor chilli sauce containing beef dices has the advantages of excellent raw materials, dainty preparation, unique diced dried tofu flavor, and good color, fragrance, taste and appearance.