We investigated the protective effects against acute renal failure (ARF) of Anemarrhena asphodeloides (AA) and performed simultaneous analysis of three compounds, neomangiferin (1), mangiferin (2), and isomangiferin (3) in AA using a high-performance liquid chromatography-photodiode array. To measure the protective effect of ARF, the levels of reactive oxygen species (ROS) and glutathione depletion were determined using a kit. HPLC analysis was performed using a Gemini C18 column at 40°C. The mobile phase used gradient elution with 1.0% (v/v) aqueous acetic acid (A) and 1.0% (v/v) acetic acid in acetonitrile (B). The flow rate was 1.0 mL/min. In our assay, AA extract inhibits cisplatin-induced production of intracellular ROS. Pre-incubation of AA extracts (10–200 μg/mL) markedly maintained cell viability compared with controls in the noncisplatin-treated cells. Calibration curves of all compounds showed good linearity (r2 0.9992). Recoveries of the three compounds were 98.9–103.4%. The relative standard deviations of intra- and inter-day precision were 0.07–1.73% and 0.12–1.49%, respectively. The amounts of the three components were 1.22–20.63 mg/g. The AA extract has potential as a therapeutic agent for treatment of ARF. In addition, the established method will help to improve quality control of AA.