The invention discloses a unidirectional wire movement prevention device which comprises a controller, a tachymeter, a locking mechanism and a mounting frame, wherein the tachymeter and the locking mechanism are mounted on the mounting frame; the tachymeter can be used for detecting whether a lead wire moves or not; the locking mechanism can be used for locking the lead wire; the locking mechanism comprises a connecting rod a, a connecting rod b, an upper pressing block, a lower pressing block, a guiding plate, a rolling shaft and a locking device; the upper pressing block and the guiding plate are fixed on the mounting frame; a guiding groove is formed in the guiding plate; one end of the lower pressing block is hinged to the connecting rod a, and a rotary shaft is arranged at the other end of the lower pressing block; a bearing is mounted on the rotary shaft; the bearing corresponds to the guiding groove formed in the guiding plate; and one end of the connecting rod a is hinged to the mounting frame, the other end of the connecting rod a is hinged to the connecting rod b, and the other end of the connecting rod b is connected with the rolling shaft. The unidirectional wire movement prevention device is matched with an existing wire clamping device and can be used for effectively preventing the lead wire from moving; and the unidirectional wire movement prevention device is convenient to use, the working efficiency can be improved, and the construction safety is increased.