The structure of GYJTA waterproof pigtail is to place the aramid fiber reinforcement element on the surface of the tight-fitting optical fiber, and then extrude the sheath to form a sub-unit. Multiple sub-units are twisted around the central reinforcing core to form a circular cable core, and the cable core is wrapped with a water blocking tape and longitudinally Wrap a layer of plastic-coated aluminum tape, and finally extrude the sheath into a cable.