The invention provides a separation technology of electrodes of a lithium ion battery. The separation technology comprises a separation technology of a positive electrode plate and a separation technology of a negative electrode plate. The positive electrode plate comprises a positive electrode active material, a positive electrode binder and aluminum foil. The negative electrode plate comprises a negative electrode active material, a negative electrode binder and copper foil. The separation technology of the positive electrode plate comprises following steps of soaking the positive electrode plate by adopting alkali liquor; and separating the positive electrode active material and the aluminum foil, wherein the ratio of the quality of the positive electrode plate to the volume of the alkali liquor is less than 0.2g/ml, and the concentration of the alkali liquor is 1-3mol/L. The separation technology of the negative electrode plate comprises following steps of soaking the positive electrode plate by adopting water; and separating the positive electrode active material and the copper foil, wherein the ratio of the quality of the positive electrode plate to the volume of the water is 0.1-0.4g/ml. The separation technology is relatively low in cost and relatively high in security.