The invention relates to an electrode piece processing technique for a lithium ion battery. The electrode piece processing technique comprises the following steps of: cutting to obtain electrode pieces in predetermined shapes for the lithium ion battery by a cutting die; laminating the electrode pieces in a manner that arbitrary two adjacent electrode pieces are laminated in a face-to-face contact way and outer edges of all the electrode pieces are right flush with one another so as to form a laminated electrode piece body; and cutting the peripheral edge of the laminated electrode piece body with laser such that burrs at the peripheral edge of the laminated electrode piece body are melted or vaporized due to heating, and the burrs melted or vaporized due to heating are taken away under the driving of airflow, thereby cutting and removing the burrs at the peripheral edge of the laminated pole piece body to obtain the electrode piece used for the lithium ion battery. With the application of the technical scheme, the remove of the burrs at the edge of the electrode piece is facilitated, a diaphragm is prevented from being penetrated, and the improvement of the electrochemical performance and the safety of the battery are promoted.