The utility model provides an overhead wire clamp, which is used for connecting an insulating rod and a flange of tested equipment. The overhead wire clamp comprises a wire clamp, an adjusting device and an insulating rod connecting member, wherein the wire clamp is used for clamping the outer periphery of the flange and is provided with a connecting end and an open end; the adjusting device is connected with the connecting end of the wire clamp, and is used for controlling the opening and clamping of the open end; and the insulating rod connecting member is connected with the adjusting device and is used for connecting the insulating rod. When in use, the insulating rod is connected with the overhead wire clamp through the insulating rod connecting member, then the operator lifts the overhead wire clamp to the tested equipment through the insulating rod, and opens the open end of the wire clamp through squeezing the flange with the wire clamp, so that the outer periphery of the flange is covered by the wire clamp, and the flange is tightly clamped by the wire clamp through the adjustment of the adjusting device, thereby completing the connection. Through the connection, the contact surface between the overhead wire clamp and the flange of the tested equipment is significantly enlarged; and through the clamping connection, the connection is more stable, and the potential safety hazard is reduced.