The invention discloses a welding method for a welding seam of a metal vacuum cup port and automatic welding equipment thereof. The welding method comprises the following steps of collecting of the welding seam data, screening of the welding seam data and controlling of welding. The automatic welding equipment using the method comprises a data measuring device, an automatic welding device and a four-power independent conveying one-way circulation device, and the automatic welding device is a laser welding device; the four-power independent conveying one-way circulation device is used for transporting and positioning a metal vacuum cup to be welded, and the four-power independent conveying one-way circulation device comprises a base 200 and conveying guiding rails 201; and a one-way drivingmechanism is arranged underneath the conveying guiding rails, and a rail changing mechanism of a sliding seat is arranged in the jointing part of the adjacent conveying guiding rails 201. According to the welding method for the welding seam of the metal vacuum cup port and the automatic welding equipment thereof, the welding quality and welding speed of the metal vacuum cup port can be improved,labor intensity is relieved, and the automatic welding equipment has extensive application market and huge economic benefits.