The aim of this study was to study and design the online counting device of the electrodes of automatic packaging machine. Based on the researches of the current production status of existing electrode production line, combined with the present packaging methods, the servo motor was adopted to control the electrode counting which was set by the rotary encoder, the tracked electrodes was controlled with infrared detection head and separated after reaching the separation position, thus the counting was completed. A total of 150 electrodes were set as one package, and the tracking action of the servo can accurately find the first tracked welding rod. There was no counting deviation. The weight deviation of each package of electrodes was within the tolerance of industrial standards. The designed online counting device of the electrodes can complete the counting task of a large number of electrodes on the conveying belt and replace manual work in the mass production, thus increasing working efficiency.