The invention provides a simple and high-efficiency method for recycling 
cobalt and 
lithium from a positive plate of a waste 
lithium ion battery, and relates to a method for recycling 
cobalt and 
lithium from the positive plate of the waste 
lithium ion battery. The method is characterized by comprising the following processes of 
ammonium sulfate roasting, in which the positive plate of the waste 
lithium battery is mixed with 
ammonium sulfate, and high-temperature 
roasting is performed to obtain reduction 
roasting slag; screening, in which the reduction roasting 
slag is vibrated and is screened by a vibration screening 
machine, and an 
aluminum foil is separated and removed to obtain reduction 
slag containing 
cobalt and lithium; acid leaching, in which the 
aluminum foil is separated and removed from the reduction roasting slag, is leached in 
sulfuric acid and is filtered to obtain a 
sulfate solution containing cobalt and lithium; 
impurity removal, in which pH of the solution is adjusted by 
sodium carbonate, and a precipitant is filtered and removed to obtain a lithium-
cobalt sulfate mixture solution; cobalt deposition, in which 
sodium hydroxide is added into the lithium-
cobalt sulfate mixture solution, the pH of the solution is controlled to be 7.5-9.5, and filtering is performed to obtain the precipitant, the precipitant is washed with deionized water at 85-95 DEG C, 
cobalt hydroxide is dried, 
cobalt hydroxide after being dried is placed in a reduction furnace, and H2 is introduced for reduction to obtain cobalt 
powder; and lithium deposition, in which pH of a lithium-containing solution is adjusted to 7-8, and an excessive amount of a lithium deposition agent is added to a lithium salt product.