The invention relates to a drug for treating severe cold and a preparation method thereof. The drug is prepared by 23 traditional Chinese medicines: Chinese ephedra, spica Schizonepetae, perilla leaf,radices puerarire, radix sileris, notopterygium root, angelica dahurica, rhizoma ligustici wallichii, bitter almond, balloon flower, liquorice, green rhizomes, dyers woad leaf, radix isatidis, forsythia, peppermint, burdock seeds, Baikal skullcap root, radix bupleuri, figwort, smallpox powder, Lophatherum gracile, pericarpium citri reticulatae, and the like. The drug can be taken conveniently andhas obvious curative effect, thereby being a good drug for treating severe cold.