The invention discloses a cable connector and a steel truss arch bridge cable connecting method. The cable connector comprises two parallel main bearing pull plates, a cavity component and a cable hole. A plurality of bolt holes are formed in each main bearing pull plate, the cavity component is arranged between the two main bearing pull plates, and the cable hole used for anchoring strands of the cable is formed in the cavity component. The steel truss arch bridge cable connecting method comprises the steps of assembling the cable connector, connecting the cable connector to an on-arch upright support, anchoring the strands of the cable, hoisting a main arch component and the cable connector to the installation position of the main arch component, tensioning the strands of the cable, and completing the cable connection construction of a steel truss arch bridge. The cable and a main arch can be safely and reliably connected under the premise of not damaging the parent metal of the main arch component, the structure is simple, the installation is convenient, and the reliability is high. The cable connector is installed on the main arch component, the operation is convenient, and the installation efficiency of steel truss arch bridge cable connecting is improved.