Main cable structure of cable crane of suspension bridge

The invention belongs to the technical field of bridges, and particularly provides a suspension bridge cable crane main cable structure. A first main cable saddle and a second main cable saddle are both double-layer cable saddles, a main cable passing wheel of a cable crane trolley is a double-layer passing wheel, the head end of a main cable is located between a first anchoring pulley and an upper-layer cable saddle of the first main cable saddle, the tail end of the main cable bypasses the first anchoring pulley leftwards, then sequentially penetrates through a lower-layer cable saddle of the first main cable saddle, a lower-layer passing wheel of the cable crane, a lower-layer cable saddle of the second main cable saddle, the second anchoring pulley, an upper-layer cable saddle of the second main cable saddle, an upper-layer passing wheel of the cable crane and an upper-layer cable saddle of the first main cable saddle, and then is connected with the head end of the main cable. After the main cable is inst