Automatic sheet feeder

The invention relates to an automatic sheet feeder. The automatic sheet feeder comprises an upper cover, a sheet feeding drawer for accommodating documents, a sheet acquisition module and a sheet baffle module, wherein, the upper cover is provided with a sheet guide plate; the sheet guide plate is equipped with a limit hole which is provided with a fixed area and a release area; and the sheet baffle module extends into the limit hole. When the automatic sheet feeder works, the sheet acquisition module swings to approach to the sheet feeding drawer, and the sheet baffle module moves from the fixed area to the release area according to swing of the sheet acquisition module so that the sheet baffle module is released so as to feed the documents into the automatic sheet feeder. Compared with the prior art, the automatic sheet feeder is light and thin.