The invention discloses a flexible explosion-proof bag, and belongs to the field of explosion prevention of society public safety. The flexible explosion-proof bag comprises a barrel body with internal as a cavity, a net bag and a cover body. A detachable net bag is mounted in the cavity in the barrel body; the cover body is positioned above the barrel body, and is bonded with the barrel body through a magic tape; the barrel body and the cover body are both manufactured by composite flexible protecting layers, and are filled with filling liquid; air injecting valves and liquid injecting valves are fixedly mounted on respective bottom side surfaces of the barrel body and the cover body; and pressure limiting valves are mounted on the end surfaces of the upper parts. The flexible explosion-proof bag is novel, simple in structure and reliable in explosion-proof effect, obviously reduces the explosive shock wave of explosives and the damage effect of fragments, is high in safety, can be applied to quick, appropriate and safe disposal (failure or destroy) through isolating the explosives by a quick-scene-assembled explosion-proof device when unknown explosives are discovered in such personal gathering places as subway stations, stations, large markets and supermarkets, and solves the difficulties in traditional reliable disposal of the explosives.