The present invention relates to an organic light emitting display device and a manufacturing method thereof. The organic light emitting display device according to an exemplary embodiment of the present invention includes: a substrate; a plurality of thin film transistors disposed on the substrate; an overcoat disposed on the thin film transistor; a thin film pattern disposed on the overcoat, the thin film pattern comprising a plurality of first portions where the thin film is present and a plurality of second portions where the thin film is not present; a first electrode disposed on the thin film pattern; an organic light emitting member disposed on the first electrode; and a second electrode disposed on the organic light emitting member. The first portion and the second portion are alternately arranged.