The invention relates to a seasoning sauce and a preparation method thereof. The seasoning sauce comprises main materials, auxiliary materials, seasonings and blend oil. The preparation method comprises the following steps: cooking the blend oil to 80 DEG C, putting 1 to 3 parts of dry chili powder into a pot, and constantly stirring in moderate heat for 10 seconds; adding fermented blank beans into the pot, and stirring for 20 seconds in moderate heat; putting cooked beef dices with bean size into the pot, and frying for 15 seconds in moderate heat; mixing powdered broad bean paste, pickled chilies and chopped chilies for 3-4 times, and constantly stirring in the pot with a scoop; putting 0.5 to 1.0 part of edible salt, 0.7 to 1.2 parts of monosodium glutamate, 1.0 to 1.2 parts of chicken essence powder, 0.2 to 0.5 part of concentrated chicken broth and 2.5 to 4.5 parts of white sugar into the pot for seasoning when the temperature is 80 DEG C; and putting the rest main materials simultaneously into the pot, cooking for 40 minutes, and cooling and packaging. The seasoning sauce has the beneficial effects of transparent and bright color, pure and rich flavor and emphasized freshness, is suitable for cooked wheaten foods, rice, rice noodles, coarse cereals and the like, can be particularly used for cooking, household and business trip, can be presented for friends, and is convenient to carry.