The embodiment of the invention discloses a radio-frequency transmission line, comprising a circuit board and a conductor piece arranged at one side of the circuit board; the circuit board comprises at least two conductor layers, the conductor layer comprises a first conductor layer and a second conductor layer which are arranged on the surface of the circuit board, the first conductor layer is provided with a microstrip line, the circuit board is provided with a conductor through hole at the position of the microstrip line, the conductor through hole is electrically connected with the conductor layer of the circuit board; a conductor piece is arranged at one side, close to the second conductor layer of the circuit board, and a gap is arranged between the conductor piece and the second conductor layer; the gap is arranged between the conductor piece and the second conductor layer to lead the microstrip line to be suspended, so as to reduce signal loss in the transmission process of theradio-frequency transmission line.