The present invention provides an OLED pixel driving circuit and a pixel driving method. The OLED pixel driving circuit utilizes the 7T2C structure, and comprises a first N type thin film transistor (T1), a second N type thin film transistor (T2), a third N type thin film transistor (T3), a fourth N type thin film transistor (T4), a fifth P type thin film transistor (T5), a sixth N type thin film transistor (T6), a seventh P type thin film transistor (T7), a first capacitor (C1), a second capacitor (C2) and an organic light emitting diode (D1), and the first scan signal (Scan1), the second scan signal (Scan2), the third scan signal (Scan3), the light emitting control signal (EM) and the data signal (Data) are combined with one another to correspond to a reset stage, a threshold voltage detection stage, a program stage and a light emitting stage one after another.