The invention discloses a cable joint connecting structure and a connecting method. The disadvantages that a cable joint and a cable conductor are inconvenient for connecting operation, the connectionreliability is bad, and the loose risk is existent are solved. The connecting structure comprises the joint body and the cable conductor; a large-diameter cylinder, a small-diameter cylinder and lugplates are arranged on the joint body; a soldering frame is arranged in the small-diameter cylinder, the soldering frame comprises a base, a plurality of support strips connected to the base; a plurality of axially arranged slots are correspondingly arranged on the inner wall of the small-diameter cylinder and the support strips one by one; the support strips are inserted into the slots in an adapting manner; a plurality of small-diameter soldering slots communicating with the slots are arranged on the outer wall of the small-diameter cylinder, and small-diameter soldering blocks are arrangedin the small-diameter soldering slots; a plurality of inward arched clamping shrapnel is uniformly arranged on the inner wall of the large-diameter cylinder, one end of each inward arched clamping shrapnel is tightly connected with the inner wall of the large-diameter cylinder, the other end movably fits with the inner wall of the large-diameter cylinder; the plurality of large-diameter solderingslots are arranged on an outer wall of the large-diameter cylinder, the large-diameter soldering blocks are arranged in the large-diameter soldering slots, and the cable conductors are inserted into the large-diameter cylinder and the small-diameter cylinder.