Waterproof wire capable of preventing threaded cover from falling off

The utility model provides a waterproof wire for preventing a threaded cover from falling off, which relates to the technical field of waterproof wires and comprises a first connecting pipe and a second connecting pipe, a connecting ring is fixed at the top of the first connecting pipe, a first connector is fixed at the top of the outer wall of the connecting ring, and a connecting block is fixed on the outer wall of the first connector. A limiting rod is movably installed in the middle of the connecting block, and a hook rod is fixed to the top of the limiting rod. According to the device, the internal thread of the first connector is connected with the external thread of the outer wall of the second connector, so that the first connecting pipe is connected with the second connecting pipe, when the limiting ring moves, the limiting ring extrudes the top of the hook rod to extrude the hook rod towards the two sides, and when the limiting ring rotates and moves downwards, the hook rod is clamped. When the bott