The present invention relates to a spine fixation device containing a set screw having a double spiral form. The spine fixation device is characterized by comprising: a pedicle fixation screw which has a head portion having a receiving groove of a certain depth formed thereinside and a plurality of female screws formed in one region of the inner circumference of the receiving groove, and a screw portion extended from one side of the head portion lengthwise and embedded into a pedicle, and is fixed to a damaged pedicle; a spine rod which is received in the receiving groove to connect the pedicle fixation screw, thereby realigning the angle and interval of the pedicle; and a set screw which forms a plurality of male screws with the same screw inner diameter, the same screw thread direction and different pitches, and is screw-coupled to the female screws of the pedicle fixation screw to prevent the movement of the rod received in the receiving groove. Therefore, the fastening force of the pedicle fixation screw and the set screw is increased, the movement of the spine rod is prevented in case of the realignment of the pedicle, and a spine can be realigned stably.