A touch driving unit for a touch display panel and a driving method thereof, a touch driving circuit and a display device. The touch driving unit includes at least two transistors of a same type. Common electrodes of the touch display panel are multiplexed as touch electrodes; and the touch driving unit is integrated on an array substrate of the touch display panel and is connected with the common electrodes, and the touch driving unit is configured to output common voltages or touch driving signals to the common electrodes.