The invention relates to the technical field of concretes, and concretely comprises an anti-radiation steel slag and steel scrap concrete and a preparation method thereof. The concrete comprises, by weight, 100 parts of 42.5 grade cement, 30-45 parts of water, 150-200 parts of steel slag, 50-80 parts of steel scrap, 30-50 parts of hematite, 20-40 parts of basalt, 5-9 parts of silicon powder, 10-15parts of mineral powder, 5-8 parts of colemanite, 10-20 parts of river sands and 1-3 parts of a water reducing agent. The concrete of the present invention has the advantages of effectiveness in utilization of the steel, high density, certain anti-radiation performance, high thermal conduction coefficient, low thermal expansion coefficient, good overall homogeneity, and no cavities, cracks or other defects.