The invention discloses a cement-based composite material - high-strength active powder concrete which comprises the following raw materials by weight: 40-55 parts of quartz sand, 25-30 parts of cement, 0-10 parts of fly ash, 0-7 parts of silica fume, 1-4 parts of steel fibers, 1-2 parts of water reducers, and 2-7 parts of water; in the components, the particle size of quartz sand is less than 1.25 mm, wherein the weight content of SiO2 is 97%. The mixing preparation comprises the following steps: weighing quartz sand and steel fibers according to the mixing ratios, adding into a stirring pot, performing dry mixing for 2 min; weighing cement and a special composite admixture according to the mixing ratios, adding into the stirring pot, performing dry mixing with quartz sand and steel fibers for 2 min; finally adding the high-efficient water reducer and water together, stirring for 6 min; after the stirring of the concrete, blanking and molding. The concrete of the invention has ultrahigh strength, low brittleness, high durability, and high compactness, brings into better play of the excellent performance of the active powder concrete, and reaches the purposes of less maintenance or free of maintenance, and prolongation of structure service life.