A double-sided organic light-emitting display apparatus includes: 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 and 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. 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 OLED display apparatus can serve as a double-sided display, and because of the use of the flexible substrate, it also has the advantage of easy carrying and flexibility.