The disclosure discloses a flat panel display device and a scan driving circuit thereof. The scan driving circuit includes a plurality of first scan drivers and a plurality of second scan drivers that are cascaded, the plurality of first scan drivers and the plurality of second scan drivers receive a clock signal alternately. The plurality of first scan drivers and the plurality of second scan drivers perform cascaded transmission according to the clock signal. The disclosure performs cascaded transmission by interposing a clock signal, which can reduce the amount of input signals and simplify the array process.