The invention discloses cantharellus cibarius brewing powder and a preparation method thereof. The cantharellus cibarius brewing powder is composed, in a total percentage by mass of 100%, of the following ingredients: 5-20% of cantharellus cibarius powder, 5-10% of highland barley powder, 20-40% of skimmed milk powder, 10-25% of non-dairy cream, 6-15% of maltodextrin, 1-6% of beta-cyclodextrin, 0.1-0.8% of sodium alginate, and 10-20% of white granulated sugar. The preparation method of the cantharellus cibarius brewing powder comprises the following steps of preparing the cantharellus cibariuspowder, preparing the highland barley powder, weighing the raw materials according to the percentage by mass, carrying out homogenization and carrying out spray-drying so as to obtain the cantharellus cibarius brewing powder. The cantharellus cibarius brewing powder is prepared from cantharellus cibarius as a raw material, as well as the highland barley powder as an added material. The prepared cantharellus cibarius brewing powder is a powered food for brewing use which is long in shelf life, easy to carry, convenient to eat, fine and smooth in taste, and mellow in cantharellus cibarius and grain flavor.