The method discloses a method for brewing tartary buckwheat wine by comprehensively using tartary buckwheat, belonging to the technical field of wine making. The method disclosed by the invention comprises the following steps: (1) preparing tartary buckwheat Xiaoqu wine by using hulled tartary buckwheat grains as a raw material and distilling distiller's grains left after the preparation of the tartary buckwheat Xiaoqu wine as distiller's grains for fermentation preparation of tartary buckwheat Xiaoqu wine next time or raw material of artary buckwheat wine; (2) soaking hulls of tartary buckwheat with the tartary buckwheat Xiaoqu wine to prepare the extracting solution of tartary buckwheat, wherein the filtered residue is used as an ingredient in preparation of tartary buckwheat wine; and (3) mixing the distiller's tartary buckwheat grains and filtered tartary buckwheat residue with sticky rice and well steaming the mixture; mixing with yeast for saccharification, then adding raw wheat koji and adding the extracting solution of tartary buckwheat for prefermentation, wherein the addition of the extracting solution of tartary buckwheat is 15-20% of the mass of sticky rice; after 12-14h, adding the tartary buckwheat Xiaoqu wine of which addition is 80-90% of the mass of sticky rice, mixing uniformly, then carrying out postfermentation and static culture until wine with dregs has no odor of distilled spirits; and finally squeezing and sterilizing. The method disclosed by the invention has the advantages that all parts of tartary buckwheat are used comprehensively, the level of resource utilization is high, and the wine body flavor of the prepared tartary buckwheat wine is unified and has a wide application range.