Abstract: In order to reduce the laser dressing error of concave-faced diamond wheels, the error models of laser masking effect and laser bevel dispersion effect were established, the error sources of laser tangential dressing of concave-faced diamond wheels were analyzed, and the deflection laser dressing method of concave-faced forming wheels was proposed. Through theoretical analysis and experimental verification, the influence of dressing parameters on the contour accuracy and circular radius of concave-faced wheels was explored. The results show that in the deflection angle range of 1°~1.5°, the beveled edge profile dressing accuracy is 8 μm; under the suitable deflection angle, the circular arc radius error is less than 10 μm; when dressing the concave arc radius of 0.2 mm and 0.5 mm, the compensation radius is 0.03 mm and 0.06 mm respectively, the concave arc radius error is reduced by 0.02 mm and 0.03 mm respectively. The deflection laser dressing method effectively improves dressing accuracy, reduces the dressing error, and provides a new idea for the dressing of concave diamonds.