The present invention provides a pixel driving circuit, a driving method therefor, and a display panel. The pixel driving circuit comprises a first transistor (T1), a second transistor (T2), a third transistor (T3), a first storage capacitor (Cst1), a second storage capacitor (Cst2), and an organic light emitting device (OLED). Capacitance values of the two capacitors are logically designed to divide a gate voltage of the first transistor (T1). Accordingly, even if a threshold voltage of T1 shows a significant negative shift, a black screen can still be provided, thus improving the contrast ratio of the display panel.