To provide a production line control system which does not require a feeding process of bar code cards liable to mistakes while producing products in a plurality of specifications in one line, and performs stable line processing without a mistake, and also to provide a production line control system for conveying products in a short period of time even if the line is filled with the products, and a panel production device to which the production line control system easily applied.

The production device of a panel which is building material has: at least a core material processing machine; a framework machine; an S/P machine; a first plywood supply machine; a first pressing device; a first inversion machine; a G/W stage; a second plywood supply machine; a second pressing device; a second inversion machine; and first/second sizer devices. By arranging these devices in this order and controlling these devices and a conveyer device by a plurality of control devices, panels in a plurality of specifications are produced in one line.