An OLED driving circuit is disclosed. The OLED driving circuit includes at least two types of pixel driving circuits for driving each pixel of an OLED display panel. The at least two types of the pixel driving circuits have different types and/or amounts of elements so a different pixel driving circuit is designed for each pixel. In comparison with a current display panel using the same driving circuit, a part of the pixel driving circuit is simplified to simplify a structure and to reduce a space occupied by the OLED driving circuit on an effective area of the display panel.