The magnetic pulse spot welding studied in this paper can achieve the connection of sheet metal with the aid of a field shaper. The magnetic field shaper which is placed between the metal components and an electromagnetic coil has the function of concentrating the magnetic field, enhancing the electromagnetic force around the weld zone, meanwhile, it can protect the electromagnetic coil. This paper carried out a numerical simulation of the principle of the field shaper for magnetic pulse welding of sheet metal by means of the FEA software COMSOL. The electromagnetic and structural parameters of the high-strength coil and field shaper have been designed, and an electromagnetic welding platform is built, the welding experiments of 304 stainless steel sheet and 1060 aluminum sheet both with a thickness of 1 mm are carried out respectively. The experimental results show that the method can achieve the connection of sheet metal very well.