Abstract: Aiming at the problem that the welding quality was affected by the reduction of the actual contact area between the electrode and the plate workpiece, and by the variation of the discharge distance and the density, because of the electrode length, electrode shape and the progressive insertion of the electrode rod after repeated grinding. The work process of FANUC robot spot welding electrode grinding, replacement and compensation was analyzed, and the function of visual technology to detect electrode grinding amount, electrode amount, electrode rod embedded amount and generate electrode work history database was studied. The FANUC macro program was used to compensate for the wear and tear of the electrode head grinding and the embedded amount of the electrode rod to ensure the stable and accurate electrode position of each welding spot. The robot resistance welding quality and refined management level were improved by management and control of electrode grinding accuracy and replacement loss cost.