A transmission line that is plugged and unplugged includes a wire and at least one socket connecting to one end of the wire. The socket is connected to an electronic device and coupled with a force applying member. The force applying member rams the electronic device when subject to a force to facilitate separation of the socket and the electronic device. The force applying member is hinged on the socket and is divided by the hinged location to form a force applying portion and a pressing portion. When the force applying portion receives the force, the pressing portion generates a counter force about the hinged location against the electronic device to make the socket to be removed from the electronic device.