The invention relates to a black wood ear small molecule peptide solid beverage and a preparation method thereof, belongs to the technical field of processing of solid granules, and provides a novel functional food for markets. A certain quantity of black wood ears are taken for making small molecule peptide powder to be used as raw materials, and then the steps of granulating, drying and packaging are performed. The black wood ear small molecule peptide granules can enhance immunity, and resist gastric cancer, esophageal cancer, gastritis and the like. An extraction principle lies in that effective components in the black wood ears are intra-cellular substances, are released from cells through high pressure, and are diffused into an extraction solvent from a porous cell membranous wall, and then through process courses of enzymolysis and the like, the black wood eat peptide powder is obtained. The making technological flows are as follows: 1, pretreating the black wood ears; 2, performing microwave sterilization on soaked substances with special technical equipment; 3, performing high-pressure difference extraction; 4, performing dreg-liquid separation with centrifuge equipment; 5, performing enzymolysis; 6, performing separation and purification; 7, performing drying with a microwave vacuum machine to make dry powder; and 8, making granules of a certain specification with a pelletizer, and performing quantitative packaging, so that the black wood ear small molecule bioactive peptide granules are made, and the molecular weight is 180-480 Dalton.