The utility model relates to a symmetric wing-type wire-clamping device, and the device comprises a wire-clamping groove installation substrate. The upper side surface of the wire-clamping groove installation substrate is provided with a first connecting hook connected with an operating rod, and the left and right sides of the lower side surface of the wire-clamping groove installation substrate are respectively hinged to the rear ends of first pull arms. The first pull arms at the left and right sides are respectively hinged to a wire-clamping block, so as to form a wire-clamping groove through the wire-clamping blocks at the left and right sides. The front ends of the first pull arms at the left and right sides are respectively hinged to the rear ends of second pull arm. The front ends of the second pull arms at the left and right sides are hinged to each other through an axis pin, wherein the hinge point is hinged to a U-shaped ring which is used for connecting an insulating stay rope. The device also comprises a straight reciprocating mechanism which is arranged along a symmetric axis of the device. Moreover, one end of the straight reciprocating mechanism is fixedly connected with the wire-clamping groove installation substrate, and the other end of the straight reciprocating mechanism is connected with the axis pin, so as to enable the straight reciprocating mechanism to just make reciprocating rectilinear movement along the symmetric axis of the device. The device is reasonable in design, is uniform in stress, is simple in structure, and is good in use effect.