Fan brilliance degree adjusting device and fan

The utility model discloses a fan brilliance degree adjusting device and fan, when driver part drive slider moved to one side, the hookup location of slider and the swing transfer line of fan kept away from from the rotation axis of driving wheel, the rotation radius increase of slider, the stroke grow of the swing transfer line of fan, this moment the fan head swing angle grow, when driver part drive slider moved to the opposite side, the slider was close to from the rotation axis of driving wheel with the hookup location of the swing transfer line of fan, and the rotation radius of slider reduces, and the stroke of the swing transfer line of fan diminishes, and the swing angle of fan head diminished this moment, as the hookup location of the swing transfer line of slider and fan during with rotation axis coincidence from the driving wheel, the slider can't drive the swing transfer line of fan and do the swing, and at this moment, the fan head is fixed, and the user can adjust the swing angle or the fan head