An method for simultaneous determination of fluorine and chlorine in leaching solution in waste lithium battery by ion chromatography was established.The fluorine and chlorine were separated and enriched by water steam distillation method at 160~180 ℃ with high-boiling sulfuric acid as distillation medium and absorbed by sodium hydroxide absorption solution, which could eliminate the interference caused by organic compounds and coexisting metal ions in the leaching solution.After passing through the 0.22 μm filter membrane,the fluorine and chlorine in absorption solution were separated with high-capa-city AS23 type anion analytical column and detected by conductivity detector using the mixture solution of 4.5 mmol/L Na ₂CO₃-1.0 mmol/L NaHCO₃ as eluent.The results showed that the fluorine and chlorine showed a good linear correlation with their corresponding peak areas in the concentration range of 0.1~10.0 mg/L with correlation coefficient of 0.999 8 and 0.999 6,respectively.The proposed method was applied to the determination of fluorine and chlorine in leaching solution in waste lithium battery with satisfactory results,registering the standard addition recovery of 95.47% and 96.29% with the relative standard deviations（RSD, n=10） of 2.9% and 3.7%, respectively.The result was satisfactory.