Abstract: On the flexible remanufacture platform based on welding robot, 3D ranging of the damage parts is the key step to obtain the remanufacturing data.This paper proposes a rapid calibration approach and calibrates the line structuredlight 3D ranging system in the flexible remanufacture platform of the welding robot.The calibration includes the following steps: first, calibrates internal and external parameters of the camera by a planar pattern;second, solves parameters of the light plane by the structured-light strip in the image, which determine the relationship between light plane and camera, and then calculate 3D coordinate of the feature point on the damage parts to establish remanufacture model.The approach is easy, simple and accurate.