The present disclosure provides an adjustable double-slot internal spinal fixation apparatus, including a first base, a second base and a connecting rod. The first base and the second base are each provided with a U-shaped slot from top to bottom. An inner wall of each U-shaped slot is provided with inner threads. The connecting rod is disposed along a horizontal direction. The second base is provided with a long slot along the horizontal direction. One end of the connecting rod is inserted in the first base, and the other end of the connecting rod is inserted in the long slot of the second base. The connecting rod can swing in the long slot. The first base and the second base are capable of relatively rotating on the connecting rod.
