The invention discloses a Yinhuang liquid for treating malnutrition, which is composed of Yinhua, forsythia, baicalin, coptis, raw rhubarb, dandelion, raw licorice, and mung bean; it can be obtained by the following method: weighing the above-mentioned components respectively, as follows Steps: (1) Pretreatment: cleanly select medicinal materials; (2) Extraction: add water to reflux the above-mentioned silver flower, dandelion, and forsythia to extract volatile oil, and collect the aqueous solution and medicinal residues after distillation; (3) Decoction: Add water to decoct the above-mentioned medicinal residues, scutellaria baicalensis, berberine, raw rhubarb, raw licorice, and mung beans twice, combine the two decoctions, filter, and condense into a concentrated solution; (4) Purification: add edible ethanol to the above-mentioned concentrated solution , layered, take the supernatant under reduced pressure to recover ethanol, add water and stir and let stand, take the stand still supernatant, filter, concentrate, mix with volatile oil and distilled aqueous solution, and filter; (5) Packing. The liquid for treating malnutrition can effectively treat or prevent oral fungus, has good curative effect, no toxic and side effects, low price and convenient clinical nursing.