The invention provides Baijiu capable of strengthening bodies and a preparation method thereof, and is characterized in that the Baijiu is prepared from the following raw materials in parts by weight: 400-450 parts of waste distiller's grains of yellow wine, 100-110 parts of rice, 100-110 parts of rice husks, 10-11 parts of broomcorn millet, 10-11 parts of orange peel, 3-4 parts of radix salviae miltiorrhizae, 2-3 parts of schisandra chinensis, 1-2 parts of cordyceps sinensis, 3-4 parts of white paeony root, 25-30 parts of Daqu, 0.5-1 part of tea polyphenol, and 0.5-0.7 part of xylooligosaccharide. The waste distiller's grains of the yellow wine are adopted as the raw material to produce the Baijiu, so that a production link of a yellow wine factory is extended, and the produced Baijiu is mellow and full and is relatively long in aftertaste; the rice husks are subjected to puffing treatment, so that the raw materials are looser; the tea polyphenol having selective bacteriostasis is added, has an inhibitory effect on acid-producing bacteria lactobacillus, has a role of maintaining the bacterial colony balance on mould and other fungi, and avoids fast acid rising of easy-fermentation materials during accumulation and fermentation; the added xylooligosaccharide can protect liver; and in addition, the Baijiu can strengthen the bodies.