A joint for a cable contains a connecting sleeve including threads around an inner wall of an upper end thereof and a shoulder on a bottom end of an inner wall thereof; an internal tube including an arresting ring extending around an upper end thereof and a circular groove around an outer wall thereof; an inner fitting member including a hole disposed on a top surface thereof, at least one curved recess formed on an outer wall thereof, and the inner fitting member including an insertion extending from a bottom end thereof; an outer fitting member including a protrusion and a first fixing section disposed on a bottom end thereof; a sheath member including a bore mounted on an upper end thereof, the bore including an annular cutout formed on an outer wall thereof and a raised loop fixed on a bottom end thereof; a banding member fitted to the annular cutout.