The invention relates to the technical field of PCB jointed board matching, in particular to an automatic PCB jointed board identification method, which comprises the following steps: acquiring a layer file containing PCB frame information, the frame information comprising coordinates and lengths of line segments forming a frame; taking the origin of coordinates as a starting point, searching a shortest
closed path based on the frame information, and forming a first
daughter board frame by an area enclosed by the
closed path; according to the shape of the frame of the first
daughter board, identifying the frames of all the
daughter boards in the substrate through a graph matching
algorithm; generating position information and rotation angle information of each daughter board relative to the first daughter board based on a matching result; according to the invention, frame layer data is directly processed, manual intervention is eliminated, and matching failure caused by wrong pad selection is avoided; the rotation angle is automatically calculated, any-angle board splicing is supported, and parameters do not need to be predefined; based on frame
template matching of geometric features, the calculation amount is reduced, and the
trial and error process is avoided; the physical frame structure is preferentially identified, and the problem of matching
fault tolerance when the bonding pad is missing or deformed is solved.