The invention relates to a beverage and a preparation process thereof and in particular relates to a health-maintaining beverage and a preparation process thereof. The health-maintaining beverage is prepared from the following components in percentage by weight: 20 percent to 30 percent of abelmoschus manihot seed, 20 percent to 40 percent of herba cistanches, 10 percent to 15 percent of radix codonopsis, 5 percent to 10 percent of radix astragali seu hedysari, 2 percent to 5 percent of moringa seed, 1 percent to 5 percent of fructus lycii and 1 percent to 5 percent of liquorice root. The preparation process comprises the following preparation steps: crushing the raw materials, percolating and extracting, concentrating and granulating; or after crushing the raw materials, preparing tea bags. According to the health-maintaining beverage and the preparation process thereof, the raw materials are matched scientifically, and tastes of all the components are properly fused; the health-maintaining beverage has the advantages of fresh and moist mouth feel, fragrance and mellow taste; meanwhile, effective components in each traditional Chinese medicine can be effectively maintained through a reasonable processing process, and the components are prepared into grains and tablets or are packaged into the tea bags; the health-maintaining beverage can be directly orally taken or is immersed to be soft with water for drinking; after being drunk for a long period, the health-maintaining beverage has the effects of nourishing heart, tonifying spleen, protecting kidney, protecting liver, improving eyesight, reducing fat, removing internal heat, resisting fatigue and improving organism immunity.