The invention discloses a method for measuring vertical section of a road surface to obtain a rolling angle between a vehicle body and the horizontal surface measured by a posture locator and to obtain distance measured by a laser distance measurer. The method comprises the following steps: obtaining the centrifugal acceleration of a vehicle body measured by a posture locator; obtaining the transverse gradient of the road surface according to the rolling angle, centrifugal acceleration of the vehicle body and the horizontal acceleration of the vehicle body; obtaining the distance between the road surface and the vehicle body according to the transverse gradient, the distance measured by the laser distance measurer and the rolling angle between the vehicle body and the horizontal surface; and obtaining the vertical section curve of the road surface through the distance measured by the laser measurer. The invention has simple measuring process through a distance signal of the laser measurer and an angel signal of the posture locator with little computation workload, draws the vertical section curve accurately, eliminates the measuring error, solves the problems that the high gradient of road surface curve can not be dynamically and rapidly measured and the rapidly-detected data of the road surface curve are inaccurate caused thereby, and provides accurate reference for road maintenance in later period.