The invention discloses a tartary buckwheat health-preserving white wine and a brewage method thereof, belonging to the field of wine brewage. The brewage method comprises the following steps: (1) stir-frying tartary buckwheat powder obtained by pulverization and separation with mild fire for later use, immersing the tartary buckwheat bran powder in edible alcohol, centrifuging the leaching solution, and storing in a sealed environment for later use; (2) spreading the stir-fried tartary buckwheat powder, sufficiently and uniformly stirring with water, steaming, and cooling by spreading; (3) adding smaller lumped koji into the steamed material to perform saccharification, adding medium/high-temperature yeast, piling, and fermenting in a sealed environment for 48-52 days; (4) after finishing the fermentation, distilling, and storing the unblended wine in a pottery cylinder; and (5) mixing the unblended wine, leaching solution and water with seriflux, and filtering to obtain the finished product wine. The tartary buckwheat white wine has the advantages of high content of functional nutritional ingredients, controllable alcohol content and unique flavor, and can satisfy the health-care demands of mass consumers.