The invention relates to galvanized plate welding, and provides a galvanized plate laser stitch welding method. Two galvanized plates to be welded are fetched, and one of the two galvanized plates is provided with a plurality of welding through holes which are distributed discretely; the two galvanized plates are overlapped, and the welding through holes are all located at the overlapping position between the two galvanized plates; the galvanized plates are welded by a laser, and the emitting light of the laser is located at one side of the galvanized plate with the welding through holes; and the emitting light of the laser irradiates into the welding through holes in sequence so as to weld the two galvanized plates. In the galvanized plate laser stitch welding method, one of the two galvanized plates is provided with the welding through holes, and the laser beam of the laser irradiates into the welding through holes, so that the two galvanized plates can be welded at the corresponding positions of the welding through holes; zinc vapor produced in this process can be diffused and removed through the through holes in time, and the pore and splashing problem can be solved effectively; and the qualified rate after welding is above 99.8%, and at the same time the tension requirements can be met.