A method for fabricating a soft mold is disclosed, in which process matching is high regardless of a size of a master mold for forming the soft mold. The method for fabricating a soft mold includes arranging a master mold on a jig, forming a pre-polymer layer in the jig, attaching a back-plane substrate onto the pre-polymer layer, selectively curing the pre-polymer layer to selectively form a polymer layer, stripping the polymer layer and the pre-polymer layer from the jig and the master mold, and removing the pre-polymer layer that is not cured.