The invention provides granite waste rock powder ceramsite pervious concrete and a preparation method thereof. The granite waste rock powder ceramsite pervious concrete is prepared from the following ingredients in percentage by weight: 60 to 75 percent of granite waste rock powder ceramsite, 10 to 25 percent of cement, 6 to 20 percent of pulverized fuel ash, 0.1 to 0.5 percent of water reducing agents and 7 to 8 percent of water, wherein the granite waste rock powder ceramsite has the grain diameter being 10 to 20mm, and is prepared from the following ingredients in percentage by weight: 50 to 80 percent of granite waste rock powder, 4 to 15 percent of clay tailings, 10 to 20 percent of waste porcelain powder, 5 to 10 percent of clay and 1 to 5 percent of coal dust. A large amount of granite waste rock powder ceramsite is used for replacing natural aggregate; the surface of the granite waste rock powder ceramsite is hard; fine and fine honeycomb micropores are formed at the inside; the characteristics of small density, low heat conductivity, high strength and good water permeability are realized. Meanwhile, the fireproof performance of the ceramsite sintered through high temperature is excellent; the consistency with the concrete is good; the performance of the pervious concrete can be obviously improved.