The invention belongs to the field of electric wire devices, and particularly relates to an electric wire device for the construction site. The electric wire device for the construction site comprisesa base, supports, a winding roller, a belt pulley A, a synchronous belt, a belt pulley B, a damping ring, an electric drive module and the like. The two supports are symmetrically arranged on the base with a moving device; and when a worker is carelessly stumbled by a use-state transition cable released from the winding roller, a suspended transition cable can pull the winding roller to rotate for two to three circles under the action of an external force, a volute spiral spring is compressed so as to store energy, and the transition cable is continuously released for a certain length by therotating winding roller so as to form buffer on the external force stressed by the transition cable, so that the transition cable is prevented from being pulled and damaged under the action of the stumbling external force, the service life of the transition cable is prolonged, the worker stumbled by the transition cable is prevented from being unbuffered stumbled by the cable so as to fall off, and the activity safety of working personnel is further ensured.