The invention discloses a transmission line for transmitting electric signals, comprising a first core wire formed by twisting two conductor wires, a second wire formed by twisting two conductor wires, and a coating layer combining and wrapping the first core wire and the second core wire and being in a continuous winding structure. Through the structure of two twisted conductor wires, the first core wire and the second wire can be prevented from generating signal coupling and/or signal interference, and by virtue of the continuous winding structure of the coating layer, the transmission wire has an elastic telescopic property for facilitating use.