The invention discloses an oral liquid used for zinc supplementation, and a preparation method thereof, and belongs to the technical field of traditional Chinese medicine health product. The oral liquid used for zinc supplementation comprises ingredients, which can be taken as both health care products and drugs, such as pseudostellaria root, prepared rehmannia root, Radix Polygoni Multiflori Preparata, and bighead atractylodes rhizome, and ingredients, which can be taken as both food and drugs, such as licorice, Poria cocos, and dried orange peel. Pseudostellaria root is taken as the sovereign drug, Radix Polygoni Multiflori Preparata is taken as the ministerial drugs, bighead atractylodes rhizome, Poria cocos, dried orange peel, and prepared rehmannia root are taken as the conductant drugs; licorice is adopted for harmonizing the above drugs. The preparation method comprises four steps including smashing, decocting, single syrup preparation, and oral liquid preparation. The preparation method is capable of extracting the effective components fully, avoiding destroy of the effective components caused by long term decoction. The oral liquid is composed of the traditional Chinese medicine components which can be taken as both health care products and drugs, or food and drugs, no antiseptic is added, traditional Chinese medicine concepts and syndrome differentiation and treatmentare taken as the principles; the oral liquid is capable of nourishing both spleen and kidney, nourishing both Qi and blood, strengthening the spleen in transportation, improving digestion functions,adjusting internal organs functions, realizing natural zinc supplementation without supplying zinc, and adjusting the integral internal organs functions.