The invention discloses an oral liquid for preventing altitude stress. The oral liquid is prepared from the following raw materials by weight: 20-30g of felwort, 10-20g of rhizoma alismatis, 10-20g of radix bupleuri, 10-20g of rheum officinale, 10-20g of liquorice, 10-20g of chrysanthemum, 10-20g of wined radix scutellaria baicalensis georgi, 10-20g of clove, 10-20g of gardenia, 8-15g of calculus bovis, 8-12g of borneol, 8-12g of curcuma aromatic, 8-12g of citrus reticulata blanco peel, 8-12g of mint, 8-12g of amomum kravanh and 8-12g of fructus amomi. The oral liquid is excellent in compatibility, reasonable in composition, and works together to reach the efficacies of tonifying qi and the spleen, clearing heat, removing dampness, clearing heart, inducing resuscitation, harmonizing the stomach, tonifying the spleen, calming down, and controlling nausea and vomiting. The oral liquid is capable of effectively improving the body immunity, promoting the blood circulation in a body, simultaneously has the effects of diminishing inflammation, sterilizing, improving the anti-anoxia ability and the anti-fatigue ability of the organism, and has unique curative effects of preventing, relieving and preventing altitude stress.