In order to maximize the utilization of iron tailings resources and achieve green and sustainable development of concrete, this article uses iron tailings mud as admixture, iron tailings crushed stone and iron tailings sand as coarse and fine aggregates to prepare full tailings concrete with a strength grade of C30. Using 20% , 30% , and 40% (mass fraction) iron tailings mud with a specific surface area of 320 and 432 m2·kg - 1 as total tailings concrete admixture, the effects of iron tailings mud content and fineness on the workability, mechanical properties, and early shrinkage performance of concrete were studied. The results show that when the fineness of iron tailings mud is 320 ~ 432 m2·kg - 1 and content is 20% ~ 30% , compared with conventional concrete with fly ash as admixture, the splitting tensile strength of full tailings concrete is increased by 6. 6% ~ 12. 8% , and 7 d shrinkage rate is reduced by 10. 4% ~ 26. 3% . Microscopic analysis shows that when the content is between 20% ~ 30% , iron tailings mud as an admixture can improve the compactness of concrete and reduce the early shrinkage of full tailings concrete.