The invention provides a selenium-enriched wheat bud seedling beverage and a preparation method thereof. The selenium-enriched wheat bud seedling beverage comprises the following raw materials in parts by weight: 60-120 parts of selenium-enriched wheat bud seedlings, 0-50 parts of selenium-enriched wheat seedling leaves, 250-1000 parts of mineral water and 5-15 parts of fresh ginger slices, wherein the selenium content of the selenium-enriched wheat bud seedlings is 0.15mg/kg-0.25mg/kg; the selenium content of the selenium-enriched wheat bud seedling beverage is 0.01mg/L-0.05mg/L. According to the selenium-enriched wheat bud seedling beverage, wheat bud seedling full stand enrichment is realized by using selenium enrichment technologies of immersing seeds, adsorbing by seedbed paper, spraying at a primary bud period and the like and the mineral water is used for carrying out whole process cultivation of wheat full stands. The full stands are squeezed so that not only are effective nutrition ingredients of the wheat bud seedling leaves kept, but also the nutrition of the roots of the wheat bud seedlings is used sufficiently; the juice yield is increased and the production cost is reduced. The beverage is reasonable in primary pulp ratio, abundant in nutrition and fresh and unique in flavor, and the varieties of the wheat bud seedling beverages are enriched.