Disclosed herein is an apparatus and method for forming a seal pattern of a flat panel display device. An apparatus for forming a seal pattern of a flat panel display panel includes a mother substrate having a plurality of unit display panels formed thereon; a stage to support the mother substrate; a mask on the mother substrate, the mask having openings, each opening being formed on a region corresponding to an outer periphery of each unit display panel; and a pattern forming unit including a seal head to apply a sealant to the mask to form the seal pattern around the outer periphery of each unit display panel of the mother substrate.