The invention provides a punching die jointed board. The punching die jointed board is characterized by comprising a single outer board body, at least one single inner board body and connecting ribs, wherein the single outer board body is provided with a hollow area, the single inner board bodies and the connecting ribs are arranged in the hollow area of the single outer board body, and the single outer board body is fixedly connected with the single inner board bodies through the connecting ribs. The invention further provides a punching forming method for circuit boards. According to the punching forming method for the circuit boards, the punching die jointed board serves as a die board, and the multiple single circuit boards with different shapes can be subjected to punching forming at the same time. The punching die jointed board and the punching forming method for the circuit boards have the characteristics of being simple in board arranging, high in machining efficiency, capable of fully utilizing the area of raw material and reducing the cost and the like.