The invention discloses a double-layer flexible explosion and annular cutting device for a large-scale steel bridge cable component. The device comprises a first semicircular shell and a second semicircular shell, connection devices are arranged on the first shell and the second shell, and the first shell and the second shell are connected into a whole circle through the connection devices; firstsemicircular cutters are arranged in the first shell and the second shell, a detonator hole is formed in the first cutter, and a detonator is installed in the detonator hole; the first cutter is put into the first shell and the second shell, the first shell and the second shell are fixed on a cable body through the connection devices, the detonator is ignited, the first cutter is detonated by thedetonator, and the first cutter generates jet flow to cut the cable body. According to the double-layer flexible explosion and annular cutting device for the large-scale steel bridge cable component,the linear energy-gathering cutter is used for detonating and cutting the cable component, relatively-less detonating equipment is needed, the detonating cut is structured, arrangement of explosive loading is conveniently conducted, and the secondary harmful effect is low.