Taking the lifting mechanism of a certain type of airport luggage transport vehicle as the research object, the front lifting form is changed from the traditional direct push type to the oil cylinder float & drawbar assembling lifting mechanism. After the new lifting structure is adopted, the maximum lifting force of the hydraulic cylinder is reduced by 21.3%, with obvious structural advantages. The position of the hinge point of the former lifting part is the optimization object. A parametric model was established, and the maximum thrust of the hydraulic cylinder was taken as the optimization object. The optimal value of each hinge position was obtained, which was 28.1% lower than the maximum thrust before optimization, the optimization effect was obvious. It can provide reference for actual optimization design.