One-dimensional detonation model and two-dimensional P-M(Prandtl-Meyer) expanding model of double vertical explosive welding were established.A one-dimensional formula of flyer plate velocity was obtained and the bending angle curve representing flying attitude of flyer plate in double vertical was deduced as well.Compared with single parallel explosive welding,the double vertical explosive welding combines two cladding plates in one explosion.Due to closed charging structure,the influence of rarefaction wave on the plate’s surface in double vertical explosive welding is eliminated and explosion loading time and displacement are increased,resulting in the increase of flyer velocity and energy utilization rate by 1.3 times to 1.6 times in different mass ratios.The analysis of microstructure in bonding zone of double vertical cladding plate under traditional charging shows that there is a clear over-melting near the interface,which is in line with the conclusion of detonation mechanism. One-dimensional detonation model and two-dimensional PM (Prandtl-Meyer) expanding model of double vertical explosive welding were established. A one-dimensional formula of flyer plate velocity was obtained and the bending angle curve representing flying attitude of flyer plate in double vertical was deduced as well. The double vertical explosive welding incorporated two cladding plates in one explosion. Due to closed charging structure, the influence of rarefaction wave on the plate’s surface in double vertical explosive welding is eliminated and explosion loading time and displacement are increased, resulting in the increase of flyer velocity and energy utilization rate by 1.3 times to 1.6 times in different mass ratios. The analysis of microstructure in bonding zone of double vertical cladding plate under conventional charging shows that there is a clear over -melting near the interface, which is in line with the conclusion of detonation mechanism.