In order to detect defects on the surface of soft pack batteries, a system based on line structured light is developed for the inspection of the surface of soft pack batteries. Firstly, a laser triangulation-based inspection system is built; the camera, light plane and moving position are calibrated to obtain the surface streak image of the battery through the camera and line structured light; the centerline of the streak is extracted by applying the Steger method. Then the morphological characteristics of the battery surface are restored through 3D reconstruction, and the type of defect is judged by combining with the surface streak characteristic curve. The experimental results show that the system can detect the type of defects and the degree of damage on the surface of soft pack batteries, and meet the needs of soft pack battery surface inspection.