The invention relates to the technical field of catalytic dehydrogenation, in particular to an isobutane dehydrogenation catalyst, and a preparation method and a dehydrogenation technology of the isobutane dehydrogenation catalyst. The preparation method comprises the following steps of: step I, preparing an appropriate amount of platinum metal dipping solution, adding into a carrier, performing dipping at negative pressure, drying and roasting the dipped carrier, step II, preparing an appropriate amount of first assistant dipping solution, adding into the carrier treated in step I, performing the dipping at the negative pressure, drying and roasting the dipped carrier, step III, preparing an appropriate amount of second assistant dipping solution, adding into the carrier treated in step II, performing the dipping at the negative pressure, drying and roasting the dipped carrier, and step IV, repeating step I to step III for many times, and obtaining the isobutane dehydrogenation catalyst. An active component is loaded onto the catalyst stepwise for many times by a dipping method, so that the active component can be distributed on the catalyst more uniformly, and the activity of the catalyst is higher and more stable.