Abstract: For the real-time detection of laser welding warping deformation of thin-walled parts, the method of real-time detection of component deformation using a line laser profiler was studied. The point cloud data of the laser welded thin plate component was collected in real-time by the line laser contonomer, tilt correction and cropping of the point cloud data were carried out, and finally the profile curve of the thin plate was fitted. Based on the above method, the three-dimensional cloud map of the plate during welding process was established, the contour curve of the plate at any time can be obtained based on the three-dimensional cloud map, and finally the longitudinal warping deformation and transverse warping deformation of the thin plate were obtained. The results show that the method can detect the warping angle of the welded plate in real-time and the subtle deformation state of the plate.