Length-adjustable DC wire

The utility model discloses a length-adjustable DC wire, which comprises a body, a limiting sleeve and a limiting rod, the limiting sleeve is sleeved on the surface of the body, the limiting rod is positioned on the rear side of the limiting sleeve, a limiting block is sleeved on the surface of the limiting rod, and a fixing mechanism matched with the limiting rod for use is arranged in an inner cavity of the limiting block. A movable mechanism used in cooperation with the fixing mechanism is arranged on the right side of the limiting block. Through cooperative use of the limiting block, the limiting rod, the body and the fixing mechanism, the limiting block is pulled, the limiting block slides on the surface of the limiting rod, the body is wound around the surface of the limiting rod, the limiting block is pulled after the length is enough, the limiting block makes close contact with the body, then the limiting block is fixed through the fixing mechanism, and limiting is completed; the problems that in the