The invention discloses self-compacting non-contract concrete used in a large-span CFST (Concrete Filled Steel Tube) arch bridge tube. The self-compacting non-contract concrete used in the large-spanCFST arch bridge tube disclosed by the invention is prepared from the following components by weight: 350 to 450 kg/m<3> of cement, 100 to 200 kg/m<3> of mineral admixture, 750 to 850 kg/m<3> of fineaggregate, 900 to 1,000 kg/m<3> of coarse aggregate, 5 to 15 kg/m<3> of high-performance polycarboxylate water-reducing agent, 50 to 60 kg/m<3> of compound expanding agent, and 150 to 175 kg/m<3> of water. According to the self-compacting non-contract concrete used in the large-span CFST arch bridge tube, mechanical properties of the concrete are ensured through an optimal design of the mixing proportion of the concrete; the high-performance water-reducing agent which is compounded with the components with the functions of reducing water, retaining slump, delaying coagulation, defoaming, thixotropic modifying and the like is doped, so that the flowability of fresh concrete is improved; dense filling of the admixture in a steel tube is guaranteed; meanwhile, the thixotropy of the fresh concrete is enhanced, and a disengaging phenomenon at the upper part of the steel tube of a horizontal section of an arch crown is remarkably improved; the compound expanding agent is doped, so that the contraction deformation of the steel tube concrete is compensated in stages in the whole process; therefore, the concrete is closely adhered to the wall of the steel tube; the concrete and the steel tube are stressed cooperatively; a hoop effect is enhanced; the structural bearing capacity is guaranteed.