Abstract: Spherical PVC Li4Mn5O12 ion sieves with diameter of about 3.5 mm were prepared by the developed PVC granulation process of Li4Mn5O12 ultrafine powder synthesized in our lab. The morphology and adsorption property were characterized by scanning electron microscopy (SEM) and methods to determine the pore size distribution, adsorption kinetics and selectivity. The nanorod structure of ultrafine powder was well maintained in the composite PVC Li4Mn5O12 ion sieve, and the spherical ion sieve had high specific surface area, high Li+ adsorption capacity and high selectivity for Li+ adsorption in simulated brine.