The utility model relates to a mechanical environment testing technique field especially relates to a centrifugal test prevents changeing adjusting device, including adjusting yoke, first connecting piece and second connecting piece, first connecting piece and second connecting piece and the coaxial setting of adjusting yoke, and first connecting piece and adjusting yoke's flexible end fixed connection, but second connecting piece and adjusting yoke's stiff end swivelling joint. The utility model discloses flexible end its canned paragraph swivelling movement relatively of adjusting yoke, thereby change adjusting yoke's whole length, at the centrifugal test in -process, second connecting piece and adjusting yoke's stiff end rotatable coupling, the excessive appearance of the relative rotation with the stiff end of flexible end that prevents adjusting yoke is not hard up, make at the centrifugal test in -process, adjusting yoke keeps the state of pretension always, thereby avoid the centrifugal test in -process to rotate because of the eccentric experimental cabin that leads to of quality, ensured that testpieces and experimental cabin keep stable position always, guaranteed that whole centrifugal test safe and reliable goes on.