This disclosure is directed to a scanning device having a which has a tray set, a movable scanning module and an automatic document feeder. The tray set has a feeding tray and a first output tray. The movable scanning module is movable between a first position and a second position. The automatic document feeder has a flip path, a feeding path, an output path, a returnable path and a feeding wheel group. The feeding path is disposed corresponding to the first position and connecting with the feeding tray and the flip path. The output path is disposed corresponding to the second position and connecting with the first output tray. The returnable path has an intersection connecting with the flip path and the output path. The movable scanning module scans two sides of the sheet at the first position and the second position respectively.

This disclosure is directed to a scanning device having a which has a tray set, a movable scanning module and an automatic document feeder. The tray set has a feeding tray and a first output tray. The movable scanning module is movable between a first position and a second position. The automatic document feeder has a flip path, a feeding path, an output path, a returnable path and a feeding wheel group. The feeding path is disposed corresponding to the first position and connecting with the feeding tray and the flip path. The output path is disposed corresponding to the second position and connecting with the first output tray. The returnable path has an intersection connecting with the flip path and the output path. The movable scanning module scans two sides of the sheet at the first position and the second position respectively.