The invention relates to a building raw material, in particular to a concrete prepared from aggregate chips, iron tailing sand and a polycarboxylic acid water reducing agent. The concrete comprises the following components in parts by weight: 239-262 parts of cement, 45-55 parts of fly ash, 71-84 parts of mineral powder, 190-210 parts of tailing sand, 800-830 parts of aggregate chips, 780-820 parts of pebbles, 163-175 parts of water, 4.8-4.9 parts of a polycarboxylic acid water reducing agent, wherein the sand rate is 0.55-0.57; the fineness modulus of the aggregate chips is 3.1, and the fineness modulus of the tailing sand is 1.7; the particle size of the pebbles is 5-31.5mm in continuous grading; and the polycarboxylic acid water reducing agent contains 0.5% of a thickening agent. Machine-made sand and river sand, which are produced by grinding pebbles according to grading, are replaced by using generally produced aggregate chips and iron tailing sand, so that the production cost is reduced, and the adaptability of a fine aggregate of the concrete with the polycarboxylic acid water reducing agent is improved; and the high water-reducing effect of the polycarboxylic acid water reducing agent is adopted, so that the water consumption is reduced, and the quality of the concrete is ensured.