The invention relates to the field of beverages, particularly to an Astragalus sinicus L health beverage, which is prepared from the following components by weight: 25-35 parts of the bud of Astragalus sinicus L, 70-80 parts of water, 0.1-0.3 part of citric acid, 5-20 parts of white granulated sugar, 0.1-0.5 part of potassium sorbate, and xanthan gum accounting for 0.1-0.15% of the total weight. The preparation method comprises: washing the bud of Astragalus sinicus L, removing root bark, placing into a 0.1% zinc sulfate aqueous solution with a temperature of 90+/-10 DEGC, carrying out hot blanching and color protection, and taking out; carrying out breaking grinding on the taken material and the partial water of the formula through a colloid mill, and collecting a slurry; and adding the remaining water, boiling at a temperature of 90-100 DEG C, sequentially adding citric acid, white granulated sugar, potassium sorbate and xanthan gum during the boiling, and uniformly stirring. According to the present invention, the health beverage has advantages of convenient taking and good taste, and can maintain the nutritional balance of the human body, maintain the normal digestive function,lower cholesterol, prevent osteoporosis and arteriosclerosis, and resist aging.