The invention discloses a method for manufacturing an enhanced flat cable for a wagon dumper, and the method is characterized by comprising the following steps: material selection, wire drawing, conductor twisting, winding and wrapping of an isolating layer, extrusion of the insulating layer, cabling of wiring harness, primary shield of wiring harness, secondary shield of wiring harness, extrusion of an outer sheath, performance detection and finished products. In the method, the conductor center of the cable is provided with a steel wire rope stiffener so as to improve the longitudinal stretching resistance of the cable; and a wire braid is used as a metal shielding layer, the primary shielding braid density is not less than 80%, and the secondary shielding braid density is not less than85%, thus not only improving shielding factors of a cable core but also providing effective physical and mechanical protective actions for the cable. The cable manufactured by the method has the advantages of good flexibleness, salt mist resistance, greasy dirt resistance and inflaming retarding property, no cracking and no deformation for long term use, and no core breaking at the movable operating mode speed of 1.2m / s.