The invention discloses a method for preparing high-performance concrete additive by using steel slag ball-milling waste residue, belonging to the technical field of concrete for building materials. The method comprises the steps: ovetails containing metallic iron is separated from the waste residue through a spiral classifier; washed turbid liquid is conveyed into a sedimentation tank; sedimentedtailing slurry with higher water content is pressed to a mud cake with lower water content by a pressure filter; the water content of the tailing slurry is reduced to below 3 percent after drying andcrushing; and then the tailing slurry enters a ball mill to be grinded to 500m<2>/kg, thus obtaining the high-performance concrete additive. The method has the advantages of simple process, low cost,superior performance, obvious effects on improving concrete strength and construction quality and reducing concrete and construction costs and environment pollution, and has significant economical and practical significance for promoting the smooth implementation of strategy of sustainable development of China.