An OLED display panel is disclosed, including: a plurality of light emitting diodes arranged from a first end of a display area of a display panel to a second end opposite thereto; an anode voltage output electrode, configured to output an anode reference voltage to a plurality of anodes of the light emitting diodes; and a cathode voltage output electrode, configured to output a cathode reference voltage to a plurality of cathodes of the light emitting diodes; the anode reference voltage is sequentially provided to the light emitting diodes from the first end to the second end, and the cathode reference voltage is sequentially provided to the light emitting diodes from the second end to the first end; or, the anode reference voltage is provided to the light emitting diodes from the first end and the second end respectively. The disclosure further discloses an OLED display device.