The work aims to characterize the mode I delamination behavior of super-hybrid composite materials accurately with a simple and efficient method, to improve the quality and efficiency of the structural design of military packing boxes of such materials. Based on Timoshenko beam theory, the semi-analytical expressions of mode I fracture toughness and bridge stress of super-hybrid composite materials were derived. The load-displacement data of double cantilever beam test were used to characterize the mode I delamination behavior of super-hybrid composite materials. The accuracy of the semi-analytical method was verified by comparing the calculated results with the experimental results. Based on the results of the semi-analytical method, a trilinear cohesive force model was established to simulate the mode I delamination behavior of super-hybrid composite materials. The accuracy of the semi-analytical method was verified by comparing the simulation results with the experimental results. The calculated results of the semi-analytical method were in good agreement with the experimental results, and the simulated results were in good agreement with the experimental load-displacement curves. The semi-analytical method can accurately characterize the mode I delamination behavior of super-hybrid composite materials by the test load-displacement data of double cantilever beams only, avoid visual observation of crack propagation length or additional tests to test material parameters, effectively reduce the test cost, reduce the test error, and improve the characterization efficiency, which has great application prospects in the field of military packing of super-hybrid composite materials.