The invention relates to a water treatment filter material, in particular to an efficient composite carborundum filter material and a preparing method and application thereof. The efficient composite carborundum filter material comprises, by weight, 60%-66% of high-purity carborundum, 25%-31% of high-purity magnetite, 4%-4.5% of rare earth and 3%-3.5% of composite agent. According to the efficient composite carborundum filter material and the preparing method and application thereof, magnetic iron ore and the rare earth are added into common carborundum, the mixture is fired into the efficient composite carborundum filter material at the high temperature, and the good application capacity for improving a supporting layer and a water distribution system is achieved; the problems that traditional sewage and drinking-water second-level filtering material are prone to hardening, fiber separating, filter breaking and falling off, and the backwashing effect is poor are solved. The efficient composite carborundum filter material is widely applied and popularized in second-level filtering of all kinds of water.