Punching die for rigid-flex board

The punching die comprises an upper die assembly and a lower die assembly which are matched with each other, the upper die assembly comprises an upper die plate, an upper base plate and an upper die core which are sequentially arranged from top to bottom, the upper die core can move up and down relative to the upper base plate, and a punching needle extending out of the upper die core is fixed on the upper base plate. A guide sleeve capable of moving up and down along the upper die core is sleeved outside the punching needle, and the lower end face of the guide sleeve extends out of the lower end face of the punching needle during die opening. The lower die assembly comprises a lower die plate fixed to the workbench and a lower die core installed on the lower die plate, a containing groove for containing the rigid-flex board is formed in the lower die core, the groove bottom of the containing groove extends downwards to form a groove corresponding to the punch pin, an ejector pin is slidably connected into th