The invention relates to a diamond grinding wheel dressing method, and belongs to the technical field of grinding apparatuses. The diamond grinding wheel dressing method comprises the following stepsthat an electroplating diamond grinding wheel and a diamond grinding wheel to be dressed are relatively ground, then the relatively ground grinding wheel to be dressed is subjected to surface cleaning, and the diamond grinding wheel is obtained. According to the diamond grinding wheel dressing method, the diamond grinding wheel and the diamond grinding wheel are relatively ground, the diamond grinding wheel is dressed, and the problem that when a silicon carbide grinding wheel is used for dressing the diamond grinding wheel in the prior art, the silicon carbide grinding wheel is consumed too fast is avoided. Meanwhile, the diamond grinding wheel is adopted as the dressing grinding wheel, the shape retention performance is good, profile modeling dressing can be adopted for the diamond grinding wheel as the grinding wheel to be dressed, and the dressing precision of the diamond grinding wheel is improved.