Abstract: In order to realize the full component recycling of waste LiFePO₄, the migration law of iron, phosphorus, lithium, aluminum, copper and magnesium in lithium extraction from waste LiFePO₄ was systematically studied using HCl and H₂O₂ as leaching agents and LiOH·H₂O as an impurity removal agent. Directional control of Al, Cu and Mg impurities was realized by adjusting system pH values, and high purity FePO₄·xH₂O slag and lithium chloride refining solution were obtained. The experimental results show that when the concentrations of H₂O₂ and HCl are 0.7 and 1.0 mol·L^-1 respectively, and the stirring speed n is 300 r·min^-1 lithium leaching rate is close to 100% while the contents of iron and phosphorus impurities in the leaching solution are 18.3 and 11.2 g·L^-1, respectively. More than 97.7% of iron and phosphorus precipitated as FePO₄·xH₂O when using LiOH·H₂O to adjust the system pH to 1.1±0.05, and other elements remained in the leaching solution. Aluminum and copper can be discharged from the system by adjusting the pH value of the leaching solution to 7.0-8.0. When the pH value of the solution was adjusted to 11.0-11.5, magnesium can be removed in the form of Mg(OH)₂. Finally, the pH value was adjusted back to neutral with hydrochloric acid to obtain a refined solution of lithium chloride with lithium recovery of 97.3%.