The invention discloses an adjustable bone tunnel graft fixing device, and belongs to the field of medical instruments. The device comprises a base, a screwing cap, a guiding rod, a main sleeve rod and a hanging ring, the outer wall of the base is provided with an external thread connected with a bone tunnel, an axial through hole is formed in the base, the hanging ring is connected to the distalend of the main sleeve rod, a blind hole is formed in the proximal end surface of the main sleeve rod, the inner wall of the blind hole is provided with an internal thread, the outer wall of the distal end of the guiding rod is provided with an external thread adapted to the internal thread of the blind hole, the outer wall of the proximal end of the main sleeve rod is provided with an external thread, the screw cap is matched with an axial through hole gap, an internal thread hole adapted to the external thread of the proximal end outer wall of the main sleeve rod is formed in the screw cap,the internal thread hole penetrates the distal and proximal ends of the screw cap, the proximal end outer wall of the screw cap is provided with a wing, the radial dimension of the wing is larger thanan axial through hole aperture, and the radial dimensions of the main sleeve rod and the guiding rod are smaller than the internal thread hole aperture. The device has reasonable design and convenient operation, can reduce the trauma during installation, and provides convenience for conducting adjustment of tightening and relaxation after installation.