Low-clinker ultra-high performance concrete and preparation method thereof

The invention discloses low-clinker ultra-high performance concrete and a preparation method thereof. The raw materials comprise a cementing material, fine aggregate, water, a water reducing agent and fibers; the cementing material comprises molybdenum tailing powder, cement, converter steel slag powder, slag powder and desulfurized gypsum; the fiber accounts for 1%-5% of the total volume of the concrete; and the low-clinker ultra-high performance concrete comprises the following raw materials except fibers in parts by weight: 10 to 200 parts of molybdenum tailing powder, 50 to 150 parts of cement, 50 to 300 parts of converter steel slag powder, 200 to 500 parts of slag powder, 50 to 150 parts of desulfurized gypsum, 1000 to 1200 parts of fine aggregate, 150 to 180 parts of water and 5 to 15 parts of polycarboxylic acid type water reducing agent, wherein the total weight part of the cementing material is 1000 parts. The cement consumption of the ultra-high performance concrete can be greatly reduced, meanwhil