The invention discloses an idle running eliminating method. The idle running eliminating method comprises the following steps: acquiring real-time physical quantity in a machining process of a machine tool; comparing the real-time physical quantity with a first threshold value, and when the real-time physical quantity is smaller than or equal to the first threshold value, controlling a feeding speed between a machining cutter of the machine tool and a workpiece to be a first feeding speed; and when the real-time physical quantity is greater than the first threshold value, controlling the feeding speed between the machining cutter and the workpiece to be a second feeding speed, wherein the second feeding speed is smaller than the first feeding speed. By the idle running eliminating method, machining time consumed in idle running during machining can be shortened, and machining efficiency is greatly improved. The invention further discloses an idle running eliminating system and the machine tool.