Abstract: In order to explore the freeze-thaw durability of iron tailings sand cement soil, the effects of iron tailings ratio, cement ratio and freeze-thaw cycles on the strength and deformation characteristics of iron tailings sand cement soil were analyzed by unconfined compressive strength test and freeze-thaw cycle test. The test results showed that under the same cement ratio, the compressive strength of cement soil with iron tailings sand increased first and then decreased with the increase of iron tailings sand ratio, and the strength increased most when the iron tailings sand ratio was 20 %. The freeze-thaw cycle had a large stress-strain damage on ordinary cement soil, but had no obvious stress-strain damage on iron tailings sand cement soil. The brittleness index of cement soil increased with the increase of freeze-thaw cycles and cement ratio, but the growth rate gradually slowed down, and the addition of iron tailings sand can reduce the brittleness index of cement soil. The peak strength of cement soil decreased first and then increased slightly with the increase of freeze-thaw cycles, and the strength of iron tailing sand cement soil under the action of freeze-thaw cycles had risen significantly. The results showed that iron tailing sand can improve the freeze-thaw durability of soil-cement, reduce the deformation of soil-cement, and make it more suitable for the frozen soil in the north.