To reveal the blast-resistant mechanism of reinforced concrete beam with kinked rebar (i-e-KRC beam), a test method with the drop-hammer impact on a specialized narrow airbag was proposed for the uniform dynamic loading on the beam component in the laboratory, and a series of simulation tests were carried out to investigate the dynamic responses and failure characteristics of the KRC beam under severe dynamic loadings. The entire process of the impact test and the failure mode of the test specimen were studied in detail. The impact force, end reaction force, beam deformation and reinforcement strain were analyzed, and the concrete cracking, plastic hinges and dynamic failure phenomena were obtained, and the influences of the bending height of the kinked rebar, etc-on the blast resistance of the KRC beam were discussed. The results indicated that the impact force and end reaction force of the KRC beam were decreased significantly, and the rising duration of the dynamic end reaction force was lengthened; the KRC beam could dissipate the impact loading energy by the way of the failure mode of “three plastic hinges”, so that its actual blast resistance could be increased significantly. Compared to the ordinary reinforced concrete (RC) beam with the same maximum deformation, the blast resistance of KRC beam with reasonable design was improved by 86.7%.