Abstract: A heat exchanger assembling apparatus includes a main conveyer for transferring a tray, at least one fin transfer conveyer and one molding plate transfer conveyer, installed at one side of the main conveyer to be parallel thereto and having a predetermined length, a plurality of fin plate assembling devices, installed between the fin transfer conveyer and the molding plate transfer conveyer in a lengthwise direction of the main conveyer, a fin molding device, connected to the fin transfer conveyer, for molding a fin, a plate molding device, installed at one side of the main conveyer, for manufacturing a plate and supplying the manufactured plate to the molding plate transfer conveyer, a fin molding plate supply device for supplying the fin molding plate assembly assembled by the fin plate assembling devices to the tray intermittently transferred by the main conveyer, an end plate assembly supply device, a special plate assembly supply device and a manifold plate assembly supply device, sequentially installed