The fracture failure model of ultra-high-strength dual-phase steel HC820/1180DPD+Z was studied, and the microstructure and mechanical properties were analyzed. Then, based on MMC fracture failure criterion, five failure samples were designed.  Furthermore, the fracture critical plastic strain and force-displacement curves of fire samples were obtained by universal testing machine and DIC, the epitaxial hardening curve of material was fit and obtained by Swift and Hockett-Sherby hybrid hardening models, and the optimal weight coefficient of hybrid hardening model and the simulation models of fire samples were obtained, based on the simulation models, the stress triaxiality and the critical plastic strain under five stress states were obtained. Finally, the failure curve of the material was obtained based on the MMC fracture failure model, and the anti-collision beam drop hammer impact test and simulation comparison analysis were used to verify the accuracy and accuracy of the model. The results show that the hybrid hardening model has a high accuracy in fitting the hardening curve of the material. When the weighting coefficient α is 0.3, the error in the maximum force value of each fracture failure sample is less than 3%. The acceleration-time curve without applying the fracture failure model is obviously inconsistent with the test curve, and the error is large. With the MMC fracture failure model, the fracture morphology is consistent with the experimental results, and the errors at the moments of fracture and maching the maximum acceleration value are 2.5% and 1.7% respectively.