An adjustment device for vestibular system of human body contains: a control module including a rotatable fulcrum unit, and the rotatable fulcrum unit having a drive unit which has four support portions which obliquely rotate upward and downward around the rotatable fulcrum unit in a circumferential operation path. The drive unit includes a motor, a drive wheel, a deceleration wheel, a belt, an actuation shaft, and two transmission members. Each universal connection rod has a universal output segment opposite to the universal input segment so that the universal input segment outputs power to the universal output segment, and the universal output segment is connected with the rotatable fulcrum unit. The carrier is connected with the four support portions of the drive unit.
