The utility model relates to a test wire box and belongs to the technical field of power supply equipment. The technical scheme is that the test wire box includes a fishing reel (1), a high-strength lock (2), a crank handle (3) and a test wire. The test wire (4) is arranged in the fishing reel (1) in a coiling manner. The crank handle (3) is arranged outside the fishing wheel (1). The high-strength lock (2) is arranged in the bottom of the fishing reel (1). The test wire box provided by the utility model has beneficial effects that condition of a test field is standardized substantially; and the test wire box is convenient to use, simple in wire connection, beneficial for improving working efficiency and safe and reliable in operation.