The present disclosure relates to a pixel driving circuit for switching display resolution, a driving method thereof, and a display apparatus. The pixel driving circuit comprises: r first data lines and k second data lines, each of the first data lines has a first switch provided thereon, and is connected to at least one of the k second data lines through at least one second switch respectively, and the first switch and the second switch are connected to a signal control unit which is configured to control the first switch to be turned on and the second switch to be turned off when display is to be performed at a first resolution, and control the first switch to be turned off and the second switch to be turned on when display is to be performed at a second resolution.