The invention discloses a preparation method of a beverage for treating pediatric acute infantile convulsions. The beverage is prepared by compounding an extract obtained after extracting a traditional Chinese medicine composition capable of effectively treating the pediatric acute infantile convulsions with blended fruit juice, and is capable of effectively treating the pediatric acute infantile convulsions, wherein the traditional Chinese medicine composition is prepared from the following raw materials in parts by weight: 5 to 7 parts of concha mauritiae arabicae, 12 to 20 parts of rhizoma phragmitis, 8 to 12 parts of plumula nelumbinis, 8 to 12 parts of herba potentillae chinensis, 2 to 3 parts of rhizoma coptidis, 6 to 8 parts of rhizoma bolbostemmae, 8 to 12 parts of radix isatidis, 8 to 12 parts of cornu bubali, 3 to 5 parts of inula herb, 2 to 4 parts of fructus trichosanthis, 2 to 4 parts of ecklonia kurome okam, 2 to 4 parts of sargassum, 4 to 6 parts of concha arcae, 8 to 10 parts of rhizoma gastrodiae, 8 to 10 parts of ramulus uncariae cum uncis, 15 to 20 parts of arillus longan, 8 to 12 parts of Chinese angelica, 8 to 12 parts of caulis spatholobi, 20 to 30 parts of fructus mori, 10 to 14 parts of bighead atractylodes rhizome, 8 to 12 parts of semen lablab album, 18 to 22 parts of rhizoma dioscoreae, 8 to 12 parts of radix pseudostellariae, 2 to 4 parts of rhizoma acori tatarinowii, 8 to 10 parts of cortex albizziae and 8 to 10 parts of caulis polygoni multiflori; the blended fruit juice is mainly prepared from the following components in parts by weight: 100 to 150 parts of apple juice, 40 to 60 parts of rosa roxburghii juice, 180 to 220 parts of snow pear juice, 20 to 30 parts of wild jujube juice, 100 to 150 parts of jujube juice and 50 to 80 parts of honey.