The utility model discloses a two -stage safety protection structure when magnetic suspension energy storage flywheel rotor is out of control, first order protection comprises toper cover, ball bearing, rotor core and fastening bolt, second level protection comprises fastening bolt, ball visor, ball and ball seat. The utility model provides a high -speed rotor two -stage protection architecture, the operation security that can improve the magnetic suspension rotor, simultaneously, the system that also can avoid causing because of the rotor unstability destroys.