The application discloses a wire core intermediate joint and a connecting method thereof, which are used for connecting two wire cores and comprise two arc-shaped flow guide connecting pipes and at least one
constant force binding spring. The arc-shaped flow guide connecting
pipe is provided with a plurality of longitudinal through grooves, the longitudinal through grooves extend from one end of the arc-shaped flow guide connecting
pipe to the other end, the
butt joint ends of the two wire cores are welded together, the two arc-shaped flow guide connecting pipes are respectively wrapped from the two sides of the
butt joint ends of the two wire cores and are closed together in
butt joint, and the
constant force binding spring is bound outside the two arc-shaped flow guide connecting pipes. The arc-shaped flow guide connecting
pipe is bound and fixed by the
constant force binding spring, the plurality of longitudinal through grooves can realize elastic contraction, the flow guide cross section is increased, the resistance at the wire core
welding point is reduced, the heating problem is solved, and an auxiliary passage is provided for the conductor current; the persistent holding force provided by the constant force binding spring can make the arc-shaped flow guide connecting pipe and the wire core conductor realize the "same
breathing" effect, so that the conductor
creep and relaxation problems are solved.