Submarine hydrogen transmission cable

The invention discloses a submarine hydrogen transmission cable, which comprises a plurality of electric unit core wires and a pipeline unit core wire, the plurality of electric unit core wires are uniformly arrayed along the circumferential direction of the pipeline unit core wire, the pipeline unit core wire comprises a plurality of sections of base pipes and a plurality of sections of reducer pipes, and the plurality of sections of reducer pipes are uniformly arrayed along the pipeline unit core wire. The diameter of the middle of the reducer pipe is smaller than the diameters of the two ends of the reducer pipe, a heat conduction material is filled between the reducer pipe and the electric unit core wire, a rotating impeller is arranged in the middle of the reducer pipe, and the rotating impeller rotates under the action of hydrogen conveying gas flow of the pipeline unit core wire and heat energy of the electric unit core wire and further provides the hydrogen conveying gas flow in the hydrogen conveying