Abstract: Glass molding is a rapid and large-scale production method for aspherical optical glass lenses, and unbound tungsten carbide is widely used as an excellent mold material in glass molding. The surface quality of tungsten carbide molds directly determines the quality of non-spherical optical glass lens products. In order to improve the surface quality of ultra-precision grinding of tungsten carbide non-spherical molds, aiming at the ultra-precision inclined-axis grinding of non-spherical tungsten carbide molds, the principle of ultra-precision inclined-axis grinding was analyzed, and parameters such as feed distance, workpiece speed, feed rate, and grinding depth were studied, and the reasonable range of the technological parameter for tungsten carbide inclined-axis grinding were proposed. Finally, through grinding optimization experiments, the optimal process plan for tungsten carbide inclined-axis grinding was put forward, thus completing the ultra-precision inclined-axis grinding experiment of tungsten carbide molds. The experimental results show that the PV value and RMS value of the grinding surface shape are 0.279 7 μm and 0.041 9 μm, respectively. It is provided with good engineering application significance.