The leaching efficiency of ion adsorption type rare earths is usually leached by 2wt% ammonium sulfate solution with 100% rare earth content by full drenching, and the amount of rare earths leached by other leaching agents compared to it, which is the leaching efficiency . The leaching efficiency is affected by the type of leaching agent, concentration, pH, leaching method, type of ore sample, solid-liquid ratio, etc. As far as leaching agents are concerned, different types of leaching agents leach different efficiencies under the same conditions. Sun Yuanyuan reported that the leaching efficiencies of different electrolytes were different at a cation concentration of 0.128 mol/L. The leaching efficiencies were in the order of (NH4)2SO4 > NH4Cl > K2SO4 > KNO3 > KCl > Na2SO4 > NaCl > NaNO3, and Yang Lifen reported that at an equivalent concentration of 0.128 N, the leaching efficiencies of the following leaching agents in the following order: Al2(SO4)3 > (NH4)2SO4 > AlCl3 > Al(NO3)3 > NH4NO3 > NH4Cl > MgSO4 > Mg(NO3)2 > CaCl2 > Ca(NO3)2 > MgCl2, and Xiao Yanfei et al reported that at a leaching agent concentration of 0.1 mol/L pH = 2, the leaching efficiency of Fe2(SO4)3 > FeSO4 > MgSO4 > ZnSO4 > Fe(NO3)2 > FeCl2 > MnSO4 > Mg(NO3)2 > MgCl2 > K2SO4 > (NH4)2SO4. It can be seen that the order of leaching efficiency is not the same when different treatments are adopted. Different concentrations of the same leaching agent leaching effect also varies, generally speaking the greater the concentration of leaching agent, the higher the leaching efficiency, but the high concentration of magnesium sulfate (5wt%) leaching effect is better than the same concentration of ammonium sulfate, while aluminum sulfate at a lower concentration has a good leaching efficiency.