Disclosed are a method and a system for detecting an uneven road surface. The method comprises a step of adopting two depth cameras to capture a depth map, and calculating a disparity map; a step of obtaining a V-disparity map by adopting a V-disparity algorithm based on the disparity map; a step of finding an oblique line corresponding to the road surface so as to let a direction of the oblique line be a direction of the road surface; a step of calculating a projection of cross sectional surface of the road surface based on the disparity map and coordinates of disappearance points; and a step of fitting the projection of the cross sectional surface of the road surface to obtain a road line on the cross sectional surface so as to extract the road surface, and letting points located below the fitted road line be road points.