The utility model discloses a concealed steel cable baffle ring disassembly tool belonging to the technical field of mechanical assembly/disassembly tools. A door nut is arranged on a threaded rod on a shaft head; and by rotating the door nut, a compressed spring seat elastically compensating for the abrasion loss of an O-shaped sealing ring can retreat to expose a steel cable baffle ring for fixing the compressed spring seat. Through the utility model, the steel cable baffle ring mounted on a shaft in a concealed manner can be assembled and disassembled conveniently and safely.