A flexible spine fixing structure includes a first flexible element and a second flexible element. The first flexible element includes a first flexible part, a first fixing part and a second fixing part. The first fixing part and the second fixing part are respectively connected to two ends of the first flexible part and used for fixing to a first vertebra, and the first flexible part includes a first through hole and a second through hole. The second flexible element includes a second flexible part, a third fixing part and a fourth fixing part. The third fixing part and the fourth fixing part are respectively connected to two ends of the second flexible part and used for fixing to a second vertebra. The second flexible part is disposed by penetrating through the first through hole and the second through hole.