The present invention relates to an apparatus for fixing the spine, and particularly to a spine fixing apparatus for fixing an unstable spine, caused by a fracture or a disease, to be properly collaborated together such that the spine can recover its stable state. The present invention provides a spine fixing apparatus, comprising a plurality of spine screw members combined to the spine with a certain distance; a pair of rods detachably combined to the spine screw members, the rods connecting and supporting the spine screw members; pressing members detachably combined to the spine screw members, the pressing member pressing the rod toward the spine screw member; and a connecting device integrally combined to the pressing member, the connecting device flexibly connecting the spine screw members.