The invention discloses superfine-aggregate concrete and a preparation method thereof. The superfine-aggregate concrete comprises the following raw materials: superfine aggregate, land cement, a composite admixture, an admixture, chopped fiber, waterborne epoxy resin, a DFG-88 curing agent, a blending agent and water, wherein the ultrafine aggregate is produced by industrially grinding one or moreof waste glass, natural sandstone and waste construction concrete. A concrete component produced from the superfine-aggregate concrete has the maximum compressive strength as high as 210.0 mpa and the splitting tensile strength as high as 30.0 mpa; the superfine-aggregate concrete has relatively high pressure resistance, bending resistance and explosion resistance and greatly weakens the brittleness characteristics of a concrete material; the superfine-aggregate concrete can solve the problem of joint connection safety during dry connection of a fabricated building system, can be used as a connecting material for fabricated building components, and provides a guarantee for improving the structural safety and the seismic performance of a fabricated building; in addition, the superfine-aggregate concrete can also be used as a 3D printed building material and a cement-based imitation ceramic tile decorative board and has adjustable working performance and adjustable material properties,and the material can be obtained and prepared through existing equipment of a commercial concrete or component product enterprise.