The invention discloses an outgoing line stringing cart of a wire, and relates to the technical field of an auxiliary tool for maintenance of a power grid. The outgoing line stringing cart comprises two supports, a first travelling wheel, a second travelling wheel and a balancing rack, wherein a locking device is arranged on the balancing rack and comprises two rotation rods, the two rotation rods are arranged at two sides of the second travelling wheel at a lower part of the balancing rack and are arranged along the balancing rack, locking handles are arranged at opposite positions of the two rotation rods and are bent inwards, the two locking handles are arranged at opposite positions of the second travelling wheel and are staggered at a part below the second travelling wheel, arc bending arms are fixedly arranged at opposite positions of the two rotation rods, upper parts of the bending arms are fixed on the rotation rods, lower parts of the two bending arms are staggered, and at least one first torsional spring is arranged on each rotation rod. By the outgoing line stringing cart, traveling operation is convenient and labor-saving, and the safety of a worker is ensured.