A magnetic force limiter (3) and vertebral body traction bed thereof the magnetic force limiter (3) comprises a magnet (3.2), a tensioning piece (3.1), a first fixed seat (3.31) and a base (3.4) the tensioning piece (3.1) is comprised of an attraction piece (3.11) and a hook (3.12) the first fixed seat (3.31) is a magnetic body, and is a groove-shaped structure formed by bending a metal plate the first fixed seat (3.31) has a middle flat seat (3.31A) and two bent end feet (3.31B) the first fixed seat (3.31) is horizontally installed and fixed on the base (3.4) the magnet (3.2) is fixed on one side of the flat seat (3.31A) of the first fixed seat (3.31), and the tensioning piece (3.1) is disposed at the other side of the flat seat (3.31A) the magnet (3.2) and the attraction piece (3.11) are separated by the flat seat (3.31A), and are attracted via magnetic force to form a tension connecting assembly external tension is applied on the tension connecting assembly via the hook (3.12) and when the tension reaches the magnetic attraction force, the tension connecting assembly will separate to release the tension. The vertebral body traction bed employing the magnetic force limiting device (3) comprises a bed body (1), an electric drive device (2) and a pulling belt device (4) the electric drive device (2) is disposed at the lower side of a bed board (1.1) the magnetic force limiting device (3) is connected in tandem with the pulling belt device (4), and the magnetic attraction force of the magnetic force limiting device (3) is the safe tension. When the traction force reaches the safe tension, the tension connecting assembly (3) is separated to release the tension, thus protecting the safety of a human body.Linvention porte sur un dispositif de limitation de force magnétique et sur un lit pour étirement du corps vertébral associé. Ce dispositif de limitation de force magnétique (3) comprend un corps magnétique (3,2), un élément détirement (3.1), une première base fixe (3.
