Electrical Discharge Dressing (EDD) of fine-grained metal-bonded diamond grinding wheel is the most recognized processing method in the industry at present. In this paper, the processing method of nanosecond pulse laser dressing of fine-grained metal-bonded diamond wheel with concave surface was proposed. The main components of the heat affected zone on the sub-surface of the wheel after laser dressing were proposed. The influence of the laser circumferential overlap ratio (O) on the size of the heat affected zone of the metal-bonded material was systematically studied, and the formation mechanism of the angle error of the wheel with different influence degree of two kinds of effects was explained as the result of the change of laser energy density. The results demonstrated that with the increase of O, the burn degree and sub-surface quality of the wheel surface became worse. The optimal laser circumferential overlap ratio O was 30 %. It was found that the laser energy was continuously lost with the decrease of the angle, and better dressing effect could be obtained by deflecting the laser. The fine-grained metal diamond wheel with concave surface dressed by the deflection nanosecond pulse laser had better surface quality and profile accuracy, but there were certain metamorphic layers. Compared with the static single-section image detection (SSID), the grinding graphite plate detection (GGPD) more reflected the actual situation, and the maximum angle, arc radius and height deviation values of the 600# concave trapezoidal contour were 0.281°, 0.0049 mm, 0.0299 mm, respectively; The maximum angle, arc radius and height deviation values of the 1000# concave V-shaped contour were 0.293°, 0.0029 mm and 0.0255 mm, respectively.