The present invention discloses a driving power supply, a display driving circuit and an organic light emitting diode display. The driving power supply comprises a boost module and a voltage adjusting module connected to the boost module; the boost module is used for boosting an initial voltage input from an initial voltage input terminal of the driving power supply to generate a reference voltage and outputting the reference voltage to the voltage adjusting module; the voltage adjusting module is used for adjusting magnitude of the reference voltage according to colors of pixel units to be driven to generate a plurality of driving voltages, respectively, and the driving voltages corresponding to pixel units of different colors are different.