The invention discloses an 
asparagus beverage and a preparation method thereof. The preparation method comprises the following steps: juicing, performing high-temperature autoclaved sterilization, performing 
lactobacillus fermentation, performing 
saccharomycetes fermentation, performing 
bacillus aceticus fermentation, mixing instant coffee and a final fermentation product, and filling. The method has the beneficial effects that the 
asparagus juice is subjected to 
lactobacillus fermentation and 
lactic acid with soft sour is generated, wild wormwood 
flavor in the 
asparagus is removed through the 
saccharomycetes fermentation, fermentation 
aroma is generated, and finally, 
acetic acid aroma is generated through the 
bacillus aceticus fermentation; the asparagus fermented beverage prepared by the method is golden yellow in color, clarified and transparent and unique in 
flavor, does not contain an additive, contains rich proteins, amino acids, vitamins, 
lactic acid and other nutritional ingredients and has the health-care effects of appetizing, tonifying 
spleen, reducing 
blood pressure, allaying tiredness and the like; moreover, according to the asparagus and coffee mixed beverage, various original nutritional ingredients of the asparagus and elegant asparagus 
aroma are kept, and the 
bitter taste of coffee is changed.