The present invention relates to a fiber bundle-opening apparatus, which comprises: a supplying unit supplying fiber bundles; a transporting unit transporting the fiber bundles supplied from the supplying unit in a lengthwise direction of the fiber bundle; and an opening unit opening the fiber bundles transported by the transporting unit in a widthwise direction and also including an opening roller formed with a plurality of screw threads on at least one portion of an outer surface where the fiber bundles are touched.
