Self-locking type safety belt backup protection rope fixing device

The invention provides a self-locking safety belt backup protection rope fixing device which is characterized in that a hoop ring is composed of a first semi-ring and a second semi-ring which are hinged to each other, a first hole is formed in one end of the first semi-ring, a second hole is formed in the other end of the first semi-ring, a third hole is formed in one end of the second semi-ring, and a fourth hole is formed in the other end of the second semi-ring; one ends of the first semi-ring and the second semi-ring are hinged by penetrating a rotating shaft into the second hole and the third hole, the other end of the first semi-ring is hinged by penetrating a perforated rotating shaft into the first hole, and the other end of the second semi-ring is hinged by penetrating a fixed shaft into the fourth hole; one end of the threaded rod is fixed to the fixed shaft, the other end of the threaded rod penetrates through a hole of the perforated rotating shaft, and the multifunctional hanging ring is fixed to