The extraction of iron from fly ash by HCl leaching and electrochemical deposition was studied. The micro-morphology and elemental composition of fly ash were systematically analyzed by SEM-EDS,XRF, ICP and XRD, and the key factors in the leaching process and their effects were investigated. The dynamic changes of pH, current density and Fe ion concentration during electrochemical deposition were also discussed. The results show that the iron leaching rate increased with the increase of HCl concentration, liquid volume to solid mass ratio, leaching temperature and leaching time. In the electrochemical deposition stage, pH increases gradually, while current density and Fe ion concentration decrease. The optimal leaching parameters are HCl concentration of 6 mol/L, liquid volume to solid mass ratio (HCl solution to fly ash) of 8∶1, reaction temperature of 90 ℃, reaction time of 90 min. For the electrochemical deposition process, the voltage is 3 V, the optimal pH range is between 0.5 and 1.9, and the final sediment is pure iron.