An apparatus for fixing a cervical spine having a self tension part used in orthopedic surgery or neurosurgery when executing an anterior fixation operation on cervical spines is disclosed, including: an extension groove formed through a plate between the insertion holes and the center of the plate a channel groove formed with stepped surfaces at both sides at the boundary of the insertion holes and the extension groove a guide that is connected to the channel groove, rotates left/rightward in the channel groove and locks the screw to be inserted into the insertion holes and a tension part that gives a pushing force the guide to be pushed toward the center of the plate and allows the guide to be rotated in the channel groove.
