The invention discloses a compound medicament for treating children cough and a preparation method thereof. The compound medicament comprises the following raw materials in portion by weight for preparing active components: 70 to 130 portions of fructus arctii, 70 to 130 portions of mulberry leaf, 15 to 45 portions of bulbus fritillariae cirrhosae, 40 to 80 portions of mint, 60 to 120 portions ofradix isatidis, 40 to 80 portions of schizonepeta spike, 40 to 80 portions of fried fructus aurantii, 40 to 80 portions of radix peucedani, 40 to 120 portions of aster, and 20 to 80 portions of licorice. The preparation method comprises the following steps: a, extracting the mint, the schizonepeta spike, the fried fructus aurantii and radix peucedani volatile oil; b, extracting and preparing the fructus arctii and the like; c, extracting and preparing the bulbus fritillariae cirrhosae; and d, preparing a finished medicament. The compound medicament has significant curative effect, high purityand small side effects for treating the children cough. The preparation method has the advantages of high extraction yield, high purity, simple operation, and suitability for industrialized production.