The invention relates to the technical field of building materials, in particular to construction waste recycled concrete and a preparing method thereof. The construction waste recycled concrete is prepared from, by weight, 225-350 parts of P O42.5 cement, 85-95 parts of II-class coal ash, 0-85 parts of S95 mineral powder, 658-1047 parts of natural fine aggregate, 741-988 parts of recycled coarse aggregate, 9-10.5 parts of an additive and 160-192 parts of water, wherein the fineness modulus of the natural fine aggregate is 2.6, and the granularity of the recycled coarse aggregate is 5-31.5 mm. On the basis of an equal mortar volume method (namely EMV method), by establishing a residual mortar volume replacement formula and analyzing and comparing physical performance of the raw materials, through a large number of creative experimental data, the most practical recycled concrete mix proportion is obtained, the quality performance of the recycled concrete is improved, and meanwhile the actual engineering application requirement is met.