The utility model discloses a prevent earth bar device that falls, the stiff end that the ring is embraced on the right side of embracing ring sum elasticity material including the left side of the unable adjustment base of magnet, elasticity material embraces the ring about, all has stiff end and a card incoming end embraced the ring about, all sets up on unable adjustment base embraces closely spaced in the diameter of earth bar between the card incoming end of ring about, embraces to form between the ring about, and holds the chamber. Perhaps will control the staple bolt of embracing the ring and changing the elasticity material into, the staple bolt setting is on unable adjustment base, and the staple bolt is ring shape, and it has the card entry to open on the staple bolt, and the width of card entry is less than the diameter of earth bar. The utility model has the advantages that: on unable adjustment base inhales earlier nearby the iron stand of suitable height, then in the earth bar card that will temporarily need not operate goes into to embrace about to ring or staple bolt, just so make temporary transient inactive earth bar keep vertical state to no longer need guardian's help, by operating personnel alone alright in order to accomplish the operation, guaranteed operation safety, reduced the time of installing and removing the earth connection simultaneously.