The utility model relates to an electric wire receive and releases line and line length measuring device, and the device battery and circuit case are installed on one side of cargo platform, are equipped with the bracing piece on cargo platform's opposite side, be fixed with the motor on the well upper portion of bracing piece, the motor shaft passes the motor bearing who establishes on the bracing piece and is connected with the spool, upper portion at the bracing piece is equipped with control platform, install the perforator of taking the photoelectric coupling switch on cargo platform or on the bracing piece, embedded ARM control panel, control platform and motor power supply are given to the battery, embedded ARM control panel is connected with control platform and motor through the circuit. Adopt the utility model discloses, can drive the rotation of receipts line carousel through the motor and receive the line automatically, simultaneously, take the perforator of photoelectric coupling switch to give the control circuit in the embedded ARM panel with the signal feedback to in the length of LCD liquid crystal display demonstration electric wire, reach the automatic purpose of receiving line and ability precision measurement line length, in addition, still can carry out control platform angular adjustment according to the user state to observe LCD liquid crystal display better.