The invention belongs to the technical field of lithium battery, and provides a Co/B co-cladded nickel cobalt manganese lithium ion cathode material, and a preparation method thereof. According to thepreparation method, in the preparation process of a lithium ion cathode material, appropriate amounts of F/W are adopted, the small amounts of F<-> and W<6+> ions are adopted to improve the circulation performance and the safety performance; the F<-> ions are high in electronegativity, so that overflow of O<2-> ions can be inhibited, material structure stability is improved, and skeleton effect is achieved; the doping of W<6+> is capable of improving material high temperature circulation performance; in secondary sintering process, Co/B double cladding is adopted, under high voltage, the Co/Bcladded cathode material is capable of improving battery circulation performance and electron conductivity, reducing residual alkali, reducing swelling, and reducing side reaction caused by contact of the cathode material with electrolyte.