Abstract: A joint structure for a cable contains a connecting sleeve including threads formed around an inner wall thereof and a shoulder extending on a bottom end of the inner wall thereof; an internal tube including an arresting ring extending around an upper end thereof and a circular groove arranged around an outer wall thereof; an outer fitting member including a hole disposed on a top surface thereof; a sheath member including an arrest rib extending around a bottom end thereof and a threaded section mounted around an inner wall thereof; a stopping loop including a plurality of resilient paws arranged around an upper end thereof and spaced apart from each other, the resilient paws being titled inward; a screwed sliding member including a screwed portion disposed around an outer wall thereof to screw with the threaded section of the sheath member.