Abstract: Ultra high performance concrete (UHPC) is faced with the problems of high cost and high self-shrinkage of cement matrix due to its extremely low water-binder ratio and high cement content in its wide application. One of the effective solutions is to replace part of cement with industrial by-products or wastes. As the waste ceramic tile has become a large amount of industrial waste, the application of ceramic tile powder in UHPC can effectively solve the problems of high consumption of cement and accumulation of waste ceramic tile. Therefore, ceramic tile powder was used to replace 10wt%, 15wt%, 20wt% and 25wt% by mass of cement to prepare a new type of green low-carbon UHPC. The effect law of ceramic tile powder on the compressive strength of UHPC was studied, and the modified Andreasen accumulation model, XRD analyses, TG/DTG, SEM observation were used to investigate the modification mechanisms, and the environmental footprint and the cost of ceramic tile powder on UHPC were also analyzed. The results show that the effect of the addition of ceramic tile powder on the compressive strength of UHPC is within ±10% at all age. Interestingly, ceramic tile powder has a significant influence on the development of compressive strength at 7-28 days and 28-60 days, and the increase rates of compressive strength of UHPC with 25wt% ceramic tile powder can reach 104.6% and 51.8%, respectively. This is mainly because that the addition of ceramic tile powder improves the packing compactness of UHPC, produces secondary hydration reaction and calcium silicate hydrate gel with low calcium-silicon ratio, improves the hydration degree of cement, and reduces the width of interface transition zone. According to environmental impact and cost calculation, ceramic tile powder can effectively reduce energy consumption, CO₂ emission and cost of UHPC.