The invention discloses an apparatus used for adjusting heights of sterilization racks. The apparatus comprises a supporting box, wherein the interior of the box is hollow, two ends of the box are open, and a supporting seat is arranged on the supporting box. A protection plate is arranged on a side wall of the supporting seat. The supporting seat is welded on an inner wall of the supporting box. The supporting box, the supporting seat and the protection plate are all made of metal materials. The apparatus used for adjusting heights of the sterilization racks has the advantages of a simple structure, convenient usage, low manufacturing cost, repeated usability and capacity of effectively adjusting the heights of the sterilization racks and holding transfusion bags of different types.