Abstract: To address the problems of existing anti-falling beam devices that cannot combine with laminated rubber bearings for energy dissipation and difficultly adapt to the temperature expansion of the main beam, a gap-type energy dissipation anti-falling beam device is proposed. The constitutive model is established based on OpenSees platform, and a prestressed concrete continuous beam bridge numerical model with this device is developed to investigate application in bridge seismic mitigation. The results show that the device exhibits full and stable force-displacement hysteretic curves, and the preset gap functions effectively. The error between numerical simulation results and experimental test data is less than 5%. It is determined that the optimal scheme is to install the device along the longitudinal direction at 3 bridge piers, with 2 devices symmetrically arranged transversely on each pier, making a total of 6 devices for the entire bridge by comparing the seismic mitigation effects of the device with different quantities and considering economic efficiency. The relative displacement between pier and beam of the side piers of the bridge equipped with the device according to the optimal scheme decreases by more than 80%, and that of the middle piers decreases by approximately 50%, which effectively mitigates the risks of girder unseating and falling through the combined mechanisms of frictional energy dissipation and ultimate displacement restraint.