Provided is an organic light-emitting display device. The organic light-emitting display device includes at least a pixel circuit comprising an organic light-emitting diode and a driving transistor for driving the organic light-emitting diode; a first supply voltage line transferring a first voltage to the pixel circuit; at least a second supply voltage line transferring the first voltage to the pixel circuit during a first period and transferring a second voltage to the pixel circuit during a second period; and a switch connected between the first supply voltage line and the second supply voltage line, wherein the switch is turned on during the first period and turned off during the second period. Accordingly, it is possible to provide a structure for reducing variations in supply voltages of an organic light-emitting display device.