The invention discloses a notoginseng flower fermented beverage and a preparation method thereof and belongs to the technical field of fermented food processing. The formula of the fermented beveragecomprises 6-8 parts of pseudoginseng flowers, 2-3 parts of Chinese wolfberry, 2-3 parts of red dates, 55-70 parts of walnut meal, 300-500 parts of drinking water, 3-6 parts of honey, 0.2-0.4 part of alactobacillus leavening agent and 8-10 parts of fructooligosaccharide. The notoginseng flower fermented beverage not only retains the unique flavor of the notoginseng flowers, but also has pleasant lactic acid flavor after fermentation, and is obtained through fermentation for 20-30 days, wherein the time is short. The fermented beverage is soft in taste, moderate in sourness and sweetness and rich in nutrition. The invention provides a beneficial bacteria fermentation process which is simple and convenient to process, safe in process and capable of making products healthy, and the beverage obtained by mixing and fermenting notoginseng flowers and other components has the effects of clearing heat, detoxifying, reducing blood pressure, regulating fat, resisting oxidation, invigorating spleen, promoting blood circulation and the like.