Disclosed is a device for machining panels, in particular panels made of derived timber products, in an essentially horizontal position. The device has a sawing and/or milling jig (5, 6) with at least one saw blade (7) and/or at least one milling cutter (8). The device is preferably fitted with a combined sawing/milling jig whose movements are controlled by computer using several parameters. The device can also have a preferably computer-controlled panel-holding rig, a suction device for removing machining residues, such as chips and dust, means for conveying the panel and/or cutouts out of the device following machining or means for lifting the machined panel.