The invention provides a quality detection method for lung-soothing syrup. The method comprises part or all of properties, inspection, identification and content measurement items, wherein the properties need to satisfy relevant regulations under Section Syrup; in the inspection, the syrup needs to conform to the relevant regulations in Section Syrup, Appendix IH, Part 1, Chinese Pharmacopedia (2005 Edition); in the component identification, ammonium chloride and licorice are identified; and in the content measurement, the content of ephedrine hydrochloride and the content of ammonium chloride are measured. The quality detection method has the advantages of high precision, high stability, favorable reproducibility, high recovery rate and accurate measurement result, enhances the quality control standard of lung-soothing syrup, and can effectively control illegal manufacturers from producing fake and poor-quality lung-soothing syrup, thereby ensuring the clinical curative effect of the preparation.