The invention relates to a novel flame-quenching and self-closing delaying pressure-relief explosion-proof door and belongs to the field of explosion venting and explosion proofing. The pressure-relief explosion-proof door comprises a base, bolts, flanges, a wire mesh, foam ceramics, contact switches, guide rods, a top cover, springs, a time control switch, electromagnets and an explosion-proof sucking disc. According to the flame quenching attenuation overpressure integrated structure, the pressure of shock waves at the outlet of the pressure-relief explosion-proof door can be effectively reduced, so that the flame spread at the outlet is obviously weakened and even quenched. According to the delaying self-closed function, the flame and shock waves generated by combustion and explosion have sufficient time to be weakened, quenched and released. The opening time of a discharging outlet can be adjusted according to the requirements to cope with explosion accidents with different levels, and the application range is wide. The flame quenching attenuation overpressure integrated structure further can effectively prevent the occurrence of a tempering phenomenon, and the integrated design structure is adopted, so that mounting, disassembling and replacement in the using process are all quite convenient.