The invention discloses coarse-grained phosphorite slag high-toughness fiber concrete and a preparation method thereof, wherein the concrete comprises the following components in parts by weight: 500-800 parts of cement, 300-500 parts of fly ash, 120-220 parts of coarse-grained phosphorous slag, 40-80 parts of silicon powder, 15-40 parts of fiber, 1-5 parts of additive, 0-1 part of cellulose, 0-2parts of rubber powder and 400-600 parts of water. According to the invention, the coarse-grained phosphorus slag (the grain size is less than or equal to 1 mm) is used for replacing natural river sand and fine quartz sand to be applied to the high-toughness fiber concrete, so that the characteristics of low density, high hardness, high activity and the like of the coarse-grained phosphorus slag can be effectively utilized, and the toughness of the high-toughness fiber concrete is enhanced; and the phosphorus slag can be greatly consumed and utilized, the production cost of the high-toughnessconcrete is reduced, and a new way is provided for the comprehensive utilization of the phosphorus slag.