In order to master the influence of PBT/A3 binder system on the explosion energy of aluminized explosive, the PBT/A3 binder system was taken as the research object, and the formulation of PBT/A3-based RDX aluminized explosive was designed by compounding RDX and Al powder. The density, detonation velocity and explosion heat of the composite explosive system were tested and compared with those of the HTPB-based RDX aluminized explosive under the same conditions, and the effects of PBT/A3 binder on the density, explosion energy, detonation velocity and explosion heat of the explosive were discussed. The shock wave overpressure performance of the PBT/A3-based aluminized explosive was tested, and the shock wave energy release characteristics of the PBT/A3-based aluminized explosive were analyzed and discussed. The results show that compared with HTPB-based RDX aluminized explosive, PBT/A3 binder can increase the charge density by 9.1%, increase the detonation velocity and heat of detonation by 1.45% and 11.47%, respectively, and increase the energy density obviously; The near-field overpressure equivalent of PBT/A3 based explosive is 1.60 times, and the far-field overpressure equivalent is 1.69 times. The introduction of PBT/A3 energetic binder system improves the oxygen balance of the composite system, which is beneficial to the complete combustion of Al powder and the energy release in the far field.