The invention discloses consolidated filling slurry for gravity-flow delivery of a coarse aggregate pipeline. The consolidated filling slurry is prepared by mixing the following raw materials in parts by weight: 220-280 parts of cement, 1386-1526 parts of sandstones and 358-391 parts of water, wherein the sandstones include rod milling sands and mung bean stones, and the mass ratio of the rod milling sands to the mung bean stones is 5:5-7:3. The consolidated filling slurry for the gravity feed of the coarse aggregate pipeline, which is disclosed by the invention, can be used for preparing the filling slurry by adopting different graded aggregates and cement, and increases the high-grade filling aggregates contained in the filling slurry; the mung bean stones replace a part of the rod milling sands, so that the uniaxial compressive strength of the consolidated filling slurry is improved, the cement unit consumption is reduced, the processing cost of the filling aggregates is lowered, and the consolidated filling slurry can be subjected to gravity-flow delivery in the coarse aggregate pipeline and meets the requirement for downhole safe production on filler strength; and according to the invention, because of the formula content of the coarse aggregates contained in the consolidated filling slurry for the gravity-flow delivery of the coarse aggregate pipeline, the unit consumption of filling cement is reduced, and the cost is saved.