The invention relates to bitter buckwheat nutritious healthy beverage and a processing technology thereof. The bitter buckwheat nutritious healthy beverage is prepared from main raw materials through main technologies of enzyme inactivation, extraction, acidolysis, extrusion puffing, gelatinization, enzymolysis, blending, homogenizing, and the like and has the health care effects of reducing blood fat and blood sugar, losing weight, and the like. In the invention, the bitter buckwheat raw material is fully utilized in the whole, almost no bitter buckwheat residue remains, and bioflavonoids, trace elements and beneficial ingredients such as mineral substances, starch, vitamins, fat, protein and the like in bitter buckwheat are preserved to the maximum extent. Compared with the prior art, the bitter buckwheat nutritious healthy beverage produced by the invention also has the advantages of high yield, high quality, high active ingredient content, simple procedure, convenience for operation, convenience for control of production parameters, fewer waste liquid and residues, small environmental pollution, and the like,.