An OLED pixel driving circuit, a driving method, and an OLED display apparatus are provided. The OLED pixel driving circuit comprises a reset module (1), a first capacitor (C1), a first transistor (T1), a charging control module (2), a driving transistor (M1) and a light-emitting control module (3); the reset module (1) is connected to two terminals of the first capacitor (C1) and configured to make the two terminals of the first capacitor (C1) have an initial voltage; a first electrode of the first transistor (T1) is connected to the charging control module (2), a second electrode thereof is connected to a first terminal of the first capacitor (C1), and a control electrode thereof is connected to a second terminal of the first capacitor (C1); the charging control module (2) is connected to the first transistor (T1) and a data line (Data); a control electrode of the driving transistor (M1) is connected to the second terminal of the first capacitor (C1), a first electrode thereof is connected to a high voltage terminal (VDD), and a second electrode thereof is connected to the light-emitting control module (3); and the light-emitting control module (3) is connected to the light-emitting device (4), wherein a difference value between a threshold voltage of the first transistor (T1) and a threshold voltage of the driving transistor (M1) is smaller than a preset value. The OLED pixel driving circuit can make the luminance of the OLED pixel within one frame picture maintain stable.