The invention discloses a high-speed feeding system for a rolling mill. The high-speed feeding system comprises a feeding module and a pre-grinding module; an outlet end of the pre-grinding module isarranged corresponding to an inlet end of the feeding module; the feeding module comprises a base; a tractor, a first feeder and a second feeder are arranged on the upper end of the base in parallel;and the pre-grinding module comprises a grinding device, a screening device and a material taking device. According to the high-speed feeding system, alternate charging and feeding between the first feeder and the second feeder can be realized by the feeding module, so that the feeding speed is greatly improved; and the pre-grinding module and the feeding module can realize cooperative productionand are in high-efficiency butt joint, so that middle carrying time and labor cost are greatly saved, and the production efficiency of an enterprise can be effectively improved.