Method for selectively recovering positive electrode material of waste power lithium battery

The invention discloses a method for selectively recovering a positive electrode material of a waste power lithium battery, and belongs to the technical field of lithium battery recovery. The method takes the positive electrode material of the waste power lithium battery as a raw material, and specifically comprises the steps of 1) pretreating the waste power lithium battery to respectively obtaina waste positive electrode active substance and a negative electrode material; 2) mechanically mixing the dried positive electrode active substance with a carbon negative electrode material, and carrying out reduction roasting under atmosphere protection; 3) carrying out water leaching on the reduction roasting slag, and carrying out solid-liquid separation to obtain a lithium leaching solution and water leaching slag; 4) recycling lithium in the lithium leaching solution by a carbonization precipitation method; and (5) placing the water leaching slag in an NH3-SO3 system for selective leaching, enabling nickel a