To establish an HPLC method for determining the content of levofloxacin in levofloxacin mesylate for injection.A Kromasil C18 column (150 mm × 4.6 mm, 5 μm) was used, the mobile phase consisted of sodium hexanesulfonate solution-methanol (70:30), and the detection wavelength was 293 nm.The linear range of levofloxacin was 20.1-180.9 μg/mL-1 (r = 0.9999).The average recovery was 99.7% with RSD 0.8% (n = 9).The method is simple, rapid, accurate, and reproducible, and it can be used for quality control of levofloxacin mesylate for injection.