The work aims to study the bearing capacity of plate packaging structure with such structure as the study object. The qualitative analysis and quantitative analysis of its structural strength was done by using mechanics principle and Ansys Workbench separately. The normal stress nephogram of packaging structure bearing aluminum plates of different thicknesses, together with the corresponding number of aluminum plates were obtained. In conclusion, plate thickness has great influence on the mechanical model of the structure. The shear stress of the dangerous section is larger when the structure is bearing thicker plates, and the shear stress will be the controlling condition; while the normal stress of the dangerous section is larger when the structure is bearing thinner plates, and the normal stress will be the controlling condition.