The present invention provides a scan driving circuit and display panel. The scan driving circuit comprises a plurality of scan driving units, each of which comprises a fan-out line, a plurality of switch sets, a plurality of control lines and a plurality of scan lines. The control lines are connected to at least one of the switches of each of the switch sets individually and the fan-out line is connected to the scan lines through the switch sets, such that the scan lines are turned on separately under control of the fan-out line and the control lines. By the above mentioned solution, the present invention drives a plurality of scan lines by one fan-out line such that an amount of the gate driving chips in the fan-out block and the layout space of the fan-out line can be reduced.