<p>With the increasing demand for complex, functionally formed parts, there is an increasing demand for processing tools with complex shapes. However, the conventional dressing of shaped grinding wheels to create irregularly shaped parts is still expensive and inefficient. Therefore, a systematic study was conducted on the trimming of shaped ceramic diamond wheels using a laser with a large deflection angle (&gt; 5°). The effects of different laser power and defocus on the ablation of ceramics and diamond were studied by simulation. The effects of different cutting depth and deflection angle on the dressing error and efficiency were studied. The simulation results show that the laser power cannot but the defocus can improve the removal difference between diamond and ceramic binder. With the increase of cutting depth, the dressing efficiency increases, and the quality of the trimmed surface decreases. The reason for the difference in precision between large and small cutting depth is attributed to changes in defocus, so the large-cutting-depth laser trimming with high efficiency can be used in the rough dressing stage. With the increase of deflection angle, the processing efficiency of the laser trimming bevel wheel increases, but the contour PV value increases. Therefore, a large deflection angle can be used for semi-precision dressing of the shaped wheel, and a suitable small deflection angle can be used for precision dressing. The best PV value of the straight contour of the shaped wheel was 10.3 µm using the method; the size error of the large arc contour was 24 µm; and the size error of the small arc contour was 17 µm. The total time required for laser dressing was approximately 3.6 h.</p>