A document image reading apparatus includes a sheet input tray, a sheet output tray, a sheet transfer channel, an image pickup device, a sheet pick-up module, and a transfer roller assembly. The sheet output tray is disposed under the sheet input tray, or the sheet output tray is disposed over the sheet input tray. After each of the plural documents on the sheet input tray is shot by the image pickup device, the document is fed into the sheet transfer channel by the sheet pick-up module. Then, the document is transmitted to the sheet output tray by the transfer roller assembly.