Sludge concrete and preparation method thereof

The invention discloses sludge concrete and a preparation method thereof. The sludge concrete comprises the following raw materials in parts by weight: 200-296 parts of cement, 172-180 parts of water, 1,030-1,066 parts of stone, 56-75 parts of fly ash, 40-78 parts of mineral powder, 530-680 parts of sand and 4.1-6.5 parts of an admixture as well as 150-180 parts of sludge, wherein the sludge is pumped from natural inland rivers, filtered and stacked, the fineness of the sludge is 0.4-0.6, the fly ash is at II grade, and the admixture is a high-performance intensifier. The sludge concrete adopts the sludge as fine aggregate instead of partial sand, as a result, the compactness and permeability of the concrete are enhanced, the durability of the concrete is improved, the production cost is lowered, and the sludge concrete has higher market popularization value and application prospects.