Worm wheel grinding is the finishing process of face gear. The dressing accuracy of grinding wheel directly affects the grinding accuracy of face gear. In this article, the influence of dressing process error on grinding tooth surface error is analyzed. The modeling and compensation method for forming dressing errors of the worm wheel for face gear grinding is proposed. Firstly, the mathematical model of the worm grinding wheel is formulated, the forming and dressing principle of face gear worm grinding wheel is analyzed, and a multi-axis coupling linkage method for dressing the worm grinding wheel of the general cylindrical grinding machine is proposed. Then, the dressing process error is decomposed into axial position error and radial position error. The influence of axial position error and radial position error on grinding tooth surface error are analyzed, and the error compensation method of forming dressing process is proposed. Finally, the grinding wheel compensation dressing, face gear grinding and measurement experiments are carried out. The experiments show that the tooth profile error of the left tooth surface is decreased from 51. 9 μm before compensation to 7. 9 μm after compensation. The tooth profile error of the right tooth surface is decreased from 35. 3 μm before compensation to 17. 6 μm after compensation. The effectiveness of the error compensation method is evaluated.