The invention relates to a method for recovering electrochemistry performance of high-nickel ternary cathode materials after storage, which belongs to the field of a lithium ion battery material. The invention relates to the method for recovering the performance of a high-nickel NCM811 material after storage, after storage of the material under air environment, internal lithium is precipitated to the surface, the internal part of the material is lack of lithium, the products generated on the surface belong to a lithium source, direct calcining treatment is employed, so that a lithium source on the surface is used for performing secondary sintering on the NCM811 material. According to the invention, waste of the material is reduced, the method is in favor of improving environment, and the obtained material enables gradient utilization. A lithium ion battery having the advantages of high energy density and long cycle life is widely used for a plurality of fields such as electric automobile. The lithium ion power battery taking the layered nickel cobalt manganese ternary material as an anode attaches great importance, especially the high-nickel ternary material, wherein a theoretical specific capacity of the NCM811 material exceeds 200 mAh.g<-1>.