The invention relates to a lithium ion battery lithium-enriched cathode material, and an improving method thereof, and belongs to the technical field of lithium ion batteries cathode material. The lithium ion battery lithium-enriched cathode material comprises a cathode material, and three commercial lithium ion cathode clad materials including LiCoO2, LiMn2O4, or LiFePO4. According to a preparation method, sol-gel method and water batch stirring heating are adopted so as to obtain a gel; drying is adopted so as to obtain a dried gel; low temperature presintering and high temperature sinteringare adopted respectively, and cooling and grinding are adopted so as to obtain the cathode material; the obtained cathode material and LiCoO2 and LiMn2O4 clad materials are dispersed in deionized water, constant temperature stirring, standing, filtering, washing, drying, and sintering are adopted so as to obtain the lithium ion battery lithium-enriched cathode material; liquid phase cladding is adopted for LiFePO4, the cathode material is dispersed in an aluminum nitrate enneahydrate solution, constant temperature stirring, standing, filtering, washing, drying, and sintering are adopted so asto obtain the needed modified material. The preparation method is simple; operation is convenient; the obtained lithium ion battery lithium-enriched cathode material is uniform in particle size distribution, high in degree of crystallization; the rate capability and the circulating performance of the obtained material after cladding are improved obviously.