A pixel driving circuit and a mobile terminal are provided. The pixel driving circuit includes a switch thin film transistor, a storage circuit, and a light driving circuit. The switch thin film transistor receives data signal applied on the data line in response to scan signal applied on the scan line. The storage circuit is charged by the data signal. The light driving circuit emits light in response to the data signal. The light driving circuit includes a driving unit, light-emitting unit, a supply voltage end, a ground end, and a voltage-dividing transistor that is coupled between the driving unit and the ground end.