The invention relates to the field of edible sauce, and particularly discloses cheese sauce and a preparation method thereof. The cheese sauce comprises a solid matter, a sweetening agent, a flavoring agent, vegetable oil, water, a flavoring agent, a preservative, an antioxidant, hydroxy propyl distarch phosphate, microcrystalline cellulose and potassium hydrogen tartrate. The preparation method comprises the following steps: step 1, weighing the solid matter, the sweetening agent, the flavoring agent, the flavoring agent, the preservative, the antioxidant, the hydroxy propyl distarch phosphate, the microcrystalline cellulose and the potassium hydrogen tartrate according to a formula, adding the weighed materials into a production pot, weighing water according to a formula, adding the weighed water into the production pot, and uniformly mixing the materials to obtain a powder mixture; step 2, performing homogenizing; step 3, adding vegetable oil and performing emulsifying; step 4, performing heating and preserving heat; step 5, taking out the product of pot; and step 6, performing packaging. The cheese sauce has the advantages that the cheese sauce is compounded by the hydroxy propyl distarch phosphate, the microcrystalline cellulose and the potassium hydrogen tartrate, accordingly, sauce systems can resist high temperatures, and the baking-resistant stability of the sauce systems can be greatly improved.