Abstract: Ultra-high performance concrete (UHPC) has attracted attention due to its excellent mechanical properties. Traditional concrete preparation consumes a large amount of natural sand, resulting in the shortage of natural sand and raising price, which increases the preparation cost of UHPC and is not conducive to maintaining stable mechanical properties of UHPC. The recycled sand produced by crushed construction waste has the potential to replace natural sand to prepare UHPC because of its plentiful sources, large reserves and green environmental protection. To verify the feasibility of recycled sand UHPC, the effects of different replacement rates of recycled sand, particle size and sand binder ratio on the tensile and compressive properties of UHPC were studied. The results show that: Recycled sand UHPC still has desired mechanical properties. With the increase of recycled sand content, the compressive strength, elastic modulus and tensile strength of recycled sand UHPC gradually decrease. The particle size and sand binder ratio have little effect on the mechanical properties. When the sand binder ratio increases from 0.6 to 0.9, the elastic modulus decreases by 5.5%. The calculation formula of UHPC static elastic modulus considering the content of recycled sand was established, and the empirical formula of compressive strength and elastic modulus was put forward. Recycled sand UHPC has the characteristics of low cost, high performance, green environmental protection. Describing basic mechanical properties and establishing the corresponding calculation formula lay a foundation for the subsequent structural application of recycled sand UHPC.