The invention relates to a medicament for allaying a fever of a child, and a preparation method thereof. The medicament is prepared from 30 parts of herba andrographitis, 25 parts of blackend swallowwort root, 25 parts of honeysuckle, 25 parts of fructus forsythia, 20 parts of folium mori, 20 parts of selfheal, 18 parts of cortex albiziae, 18 parts of astragalus membranaceus, 18 parts of scutellaria baicalensis, 15 parts of radix bupleuri, 15 parts of Chinese mahonia stem, 15 parts of ligusticum wallichii, 13 parts of semen raphani, 12 parts of fruit of Chinese wolfberry, 12 parts of liquorice, 10 parts of pinellia ternate, 10 parts of root of red-rooted salvia, 7 parts of peach kernel, 7 parts of cassia twig, 5 parts of root of common peony, 5 parts of rhizoma zingiberis and 3 parts of bamboo leaves. The medicament treats both symptoms and root causes aiming at the fever of the child, is free of poison and harm to a human body, free of side effect, low in price, and simple and convenient to prepare, and has a wide application prospect.