The present application discloses a double sided organic light-emitting display apparatus, including: a rigid substrate; a transmission flexible substrate and a reflective flexible substrate formed on the rigid substrate; a display substrate having a plurality of switching elements formed on the transmission flexible substrate and the reflective flexible substrate; and a top-emission OLED light-emitting layer and a bottom-emission OLED light-emitting layer formed on the display substrate, wherein the top-emission OLED light-emitting layer is corresponding to the reflective flexible substrate and the bottom-emission OLED light-emitting layer is corresponding to the transmission flexible substrate. The present application also provides a method of manufacturing the OLED display apparatus. The OLED display apparatus can achieve the double sided display, and because of its use of the flexible substrate, it also has the advantage of ease of carrying and flexible property.