Welding seam detection method and welding system

The invention discloses a welding seam detection method and a welding system. The welding seam detection method comprises the following steps: acquiring a plurality of contour images of a plurality of welding seam sections at different positions in the extension direction of a welding seam in real time; analyzing each contour image in the plurality of contour images to calculate and obtain actual welding seam size information corresponding to each contour image; and comparing the actual welding seam size information with the standard welding seam size information, and if the actual welding seam size information does not accord with the standard welding seam size information, acquiring the position of the welding seam section which does not accord with the standard welding seam size information on the welding seam according to the plurality of contour images. According to the welding seam detection method, real-time detection of the welding seam can be achieved, the size of the welding seam is directly analyze