OLED pixel driving circuit, array substrate and display device are provided. The pixel driving circuit comprises a driving control unit, a first light emitting unit and a second light emitting unit. Two OLEDs share one driving control unit, so the two OLEDs alternately emit light. In this way, light emitting time of the OLEDs is reduced, number of parasitic capacitors and data lines in a panel is reduced, and aperture ratio of the OLED device is increased; and OLEDs are enabled to be in reverse bias in a non-light emitting display frame, so that OLEDs do not have to be in a DC bias state for a long time, and thus, aging of the OLED device is slowed down. No other reverse bias voltage is connected externally, difficulty of tracing of the pixel circuit and crosstalk from a bias voltage line to other signal lines are reduced.