The invention discloses cheese sauce, cheese-flavored thick milk and a preparation method thereof, and the cheese sauce comprises the following raw materials in 1000 parts by weight: 300-500 parts by weight of natural cheese, 60-160 parts by weight of
skimmed milk powder, 30-100 parts by weight of white granulated
sugar, 7-12 parts by weight of emulsifying salt, 1-2 parts by weight of hydroxy propyl distarch and the balance of water. The natural cheese comprises
cream cheese, 12-month mature cheddar cheese and 24-month mature cheddar cheese in a
mass ratio of (5-6): (2-3): 1. The cheese-flavored thick milk prepared by adopting the cheese sauce disclosed by the invention has rich, mellow and smooth
flavor and taste, and the purpose of cheese fragrance can be achieved without adding essence; meanwhile, the thickness of the cheese-flavored thick milk can be effectively improved under the condition that the stability is effectively guaranteed, and the effect is very remarkable.