Geometry constructions of honeycomb core are finding increasing use because of their relative advantages over other structural materials in terms of improved stability, high stiffness to weight and strength to weight ratios. It provides an efficient solution to increase bending stiffness without significant increase in structural weight. However, honeycomb carton, as a new product of paper honeycomb, has been made by bending forming and failure process of paper honeycomb. Theoretical analysis on bending mechanical properties of paper honeycomb has been done. Then a model has been built on finite element analysis (FEA) software and analyzed its nonlinear bending process. The shear deformation process of honeycomb carton may be approximately categorized into four phases: linear elastic phase, elastic-plasticity phase, plasticity collapse phase, densification and fracture phase. In order to get precise results, not only shear force but also the failure process of paper-core should be considered. Therefore, the curve of external force and the shear deformation process has been analyzed. In addition, stress concentrations due to bending load and cohesive force have been eliminated by drying process of honeycomb carton. At last, the results are introduced by experiment and put into practice.