In order to study the effect of drying-wetting cycling on the performance of pavement foam concrete. The drying and wetting cycles tests were carried out to study the regularity of the unconfined compressive strength of the foamed concrete and the number of cycles of wetting drying and wetting. The results show that as the specimen is subjected drying and wetting cycle, the appearance of cracks leads to a sharp increase in water absorption, then the development of cracks slows down and the water absorption volume gradually stabilizes. Under the action of drying and wetting alternation with the large change of temperature, the structural of foamed concrete can be easily damaged by through cracks. However, the influence of drying-wetting cycles on strength is not obvious, and the range of change is controlled within 10%.