The separation method of lithium cobalt oxide and aluminum foil on the positive electrode sheet of the scrap lithium-ion battery, the steps are: discharge and disassemble the waste lithium-ion battery, and then put the waste positive electrode sheet into a box-type resistance furnace and bake it at 500~600°C , put the roasted positive electrode sheet into a container with water and stir it with an electric stirrer, then sieve the material in the container with a sieve, the sieve is aluminum foil, the sieve aluminum foil is washed with water, and dried naturally Aluminum foil is obtained; the undersize is a mixed solution containing positive active substances, the undersize is suction filtered, and the filtered oversize after natural drying is put into a ceramic crucible, and then placed in a box-type resistance furnace for high temperature treatment to obtain Lithium Cobalt Oxide. Compared with the prior art, the present invention has the advantages of easy operation, low requirement for separation equipment, high separation efficiency and low cost of lithium cobalt oxide and aluminum foil, no need to use any organic solvent in the treatment process, and no secondary pollution during the separation process.