The invention discloses coarse-aggregate-containing C220-strength-grade ultrahigh-performance fiber concrete and a preparation method. The concrete is composed of, by mass, 545 parts of cement, 63 parts of water, 900 parts of rubble, 750 parts of fine aggregate, 72 parts of coal ash, 65 parts of rice husk ash, 140 parts of silicon ash, 15.5 parts of water reducer, 11.5 parts of excitant, 1.7 parts of cellulosic fiber, 78 parts of steel fiber, 48 parts of hydroxyl modified carbon nanotube dispersion, 50 parts of oxidized graphene dispersion and 2.9 parts of defoamer. The concrete prepared by the method has high toughness and durability and has high binding strength with section steel, compressive strength reaches 224.31MPa, bending strength reaches 47.45MPa, splitting tensile strength reaches 22.37MPa, the binding strength with the section steel reaches 8.92MPa, and chlorion anti-permeation grade reaches VI grade. When the concrete is used in a section steel and concrete combined structure, cooperative working performance between the section steel and the concrete can be brought into play effectively, and the defects that the section steel and the concrete are poor in binding performance and respective mechanical performance of the section steel and the concrete cannot be brought into full play are made up.