The utility model discloses a control box for transmission line parameter testing lead wire. It includes short circuit switch, copper bar and the control box that comprises upper cover, box and handle, and it lies in that adaptation position in the box is equipped with 3 stranded annealed copper wires and 1 ground connection stranded annealed copper wire, wherein 3 stranded annealed copper wires equally divide do not with the moving contact one end series connection of terminal screw and short circuit switch, 1 individual ground connection stranded annealed copper wire is established ties with the moving contact one end of earthing terminal short circuit switch, short circuit switch and the static contact one end of earthing terminal short circuit switch all be connected with the copper bar at the incasement. The utility model discloses better satisfied test requirement, convenient test wiring and improve the safe auxiliary device of test. And have convenient to carry, the multi -pass operation saves time, and change wiring is laborsaving fast, and effectual area of contact when having increased between the circuit short circuit has reduced the transition resistance in the return circuit, has improved the accuracy of test, and it is convenient to make the test operating personnel change the wiring, furthest's assurance the personal safety.