The invention discloses a method for efficiently recycling and regenerating a positive electrode material of a waste lithium ion battery. The method comprises the following steps: completely discharging, disassembling, stripping, calcining and grinding the recycled waste lithium ion battery to obtain a LiNi0.5Co0.2Mn0.3O2 active material; leaching the active material by using a leaching agent to obtain a leaching solution rich in lithium and a precipitate containing nickel, cobalt and manganese; dispersing the obtained precipitate in water, adding alkali liquor, and adjusting the pH value to obtain nickel cobalt manganese hydroxide precipitate; filtering the nickel cobalt manganese hydroxide precipitate to obtain a ternary precursor, carrying out lithiation on the ternary precursor and anexcessive lithium source according to the amount of substance of the ternary precursor, performing grinding, mixing and calcining to obtain a positive electrode active material; adding inorganic acidinto filtrate obtained after filtering, generating new organic acid, and realizing recycling of the organic acid. By using the method provided by the invention, the ternary positive electrode materialcan be recycled, the process is simple, the processing cost can be effectively reduced, and the recycling of organic acid can be realized.