The invention relates to a cable bridge with double-layer main cable, belonging to bridge engineering filed. Cable bridge with double-layer main cable comprises anchorages arranged on both sides of a river channel, main cable laid between the anchorages and bridge deck slabs laid on the main cables. The main cable comprises upper main cable and lower main cable. The upper main cable and the lower main cable are connected by steel bent frames. The vector of the lower main cable is larger than the upper main cable. The main cable is divided into two layers. The lower main cable is adopted with a catenary with larger vector to reducing the tension the main cable. The lower main cable is provided with the steel bent frames connecting with the upper main cable. The upper main cable is adopted with the catenary with smaller vector to improve traffic conditions. Meanwhile, the steel bent frames on the lower main cable plays an elastic supporting role for the upper main cable, which is equivalent to dividing the upper main cable into a multi-span cable bridge, thus reducing the tension of the upper main cable. Double main cables of a cable bridge can effectively improve the traffic condition and reduce the tension of the main cables.