Pixel driving circuit, driving method, pixel circuit and display device

The invention provides a pixel driving circuit, a driving method, a pixel circuit and a display device. The pixel driving circuit is separately connected with a grid line of corresponding row and a data line of corresponding column to drive a light-emitting component to emit light, the pixel driving circuit comprises a driving transistor, and the pixel driving circuit also comprises: a light-emitting control unit which is separately connected with a first electrode of the driving transistor, a second electrode of the driving transistor, a high level input end and the light-emitting component; a data writing unit which is separately connected with a gird line of the corresponding row, a data line of the corresponding column, the first electrode of the driving transistor, a gird of the driving transistor and the second electrode of the driving transistor; and a capacitor unit of which first end is connected with an initial voltage input end, and second end is connected with the grid of the driving transistor. According to the invention, a problem of many signal lines and transistors adopted by a pixel driving circuit in the prior art is solved.