Electromagnetic vertical launcher for shipborne missile is a promising innovative missile launching system: its power supply system is the focus of research. By analyzing the principles, composition and working process of shipborne missile vertical launch system, according to electromagnetic coil launch index, all of launcher energy, transmitter efficiency, the relationship between charge voltage and capacitance was got. Through simulation, design of charger parameters was completed, reliability of shipboard power of shipborne missile electro-magnetic vertical launch system was enhanced, providing reference data for the engineering.