The present disclosure provides an OLED pixel driving circuit, a driving method thereof and a display device including the same. The OLED pixel driving circuit includes: a first transistor, providing driving current to an organic light emitting diode, and comprising a first terminal, second terminal and control terminal coupled to a first node, second node and third node respectively; a power switch unit, coupled between a power supply voltage and the second node; a first switch unit, coupled between a data line and a fourth node to couple a data voltage signal from the data line to the fourth node; a second switch unit, coupled between the third node and the second node to enable the first transistor connected as a diode; a first capacitor, coupled between the fourth node and the first node; and a second capacitor, coupled between the fourth node and the second node.