Abstract: A rubber-plastic alloy for a warm mix asphalt mixture and a method for manufacturing the same are disclosed. The rubber-plastic alloy consists of plastic, crumb rubber, cracked wax and rubber oil. The manufacturing method includes extruding the plastic, the crumb rubber, the cracked wax, and the rubber oil at suitable ratio via a single screw extruder, and pelleting via a water-cooled die-face cutter. The rubber-plastic alloy is mixed with a hot mineral material in an asphalt mixture mixer, and then liquid asphalt matrix is pumped into the mixer via an asphalt pump to provide a warm mix rubber-plastic modified asphalt mixture. The rubber-plastic alloy is applied for modifying an asphalt mixture to an effect equivalent to that achieved by a wet method.