The invention discloses a traditional Chinese medicine for treating influenza and a preparation method thereof. The traditional Chinese medicine is prepared from the following medicinal materials: folium isatidis, radix bupleuri, cassia twig, herba schizonepetae, radix paeoniae alba, solidago decurrens, fructus forsythiae, fructus arctii, radix scutellariae, perilla leaves, almonds, radix puerariae, rabdosia rosthornii, radix sophorae subprostratae, honeysuckle, cyrtomium rhizome, codonopsis, radix platycodi, oriental wormwood, divaricate saposhnikovia roots, leucas ciliata benth., pinellia, ginger, straight ladybell roots, plaster stone, dennstaedtia scabra, gentiana urnula, pteris vittata, radix isatidis, hog brake, mint, radix peucedani, radix astragali, radix ophiopogonis, candolle thorowax herb, elsholtzia cypriani, bamboo shavings, evodia lepta, immature bitter orange, cleavers, notopterygium, jujube, cynanchum glaucescens, fritillary bulb, rhizoma belamcandae, hawthorn, dandelion, chrysanthemum, rhubarb, and licorice. Proved by clinical experiments, the traditional Chinese medicine disclosed by the invention can safely and effectively treat influenza.