It was significant to study the variations of soil physicochemical properties, atmospheric/soil temperature and soil carbon flux in sand‐fixing revegetated areas of arid regions, and to elucidate the relationship between soil carbon flux and influencing factors such as moisture, nutrients and temperature. This enabled a scientific assessment of the influence of sand‐fixing revegetated restoration on desert ecosystems' carbon budget changes. In the Babusha Forest Farm of Gulang County, this study selected four revegetation types—Caragana korshinskii Kom., Ulmus pumila L., Elaeagnus angustifolia L., and Hedysarum scoparium Fisch. et Mey. stands—with bare sandy land as the control. Using an LI-8100 soil carbon flux system, we conducted in situ measurements of soil carbon flux, surface temperature, and shallow soil temperature at 5 cm depth across these sand‐fixing revegetation areas. Soil physicochemical properties, atmospheric/soil temperature, and soil carbon flux characteristics were determined and analyzed. Regression analysis was employed to elucidate relationships between soil carbon flux and influencing factors (moisture, nutrients, temperature). The results indicated that: (1) The diurnal variation of soil carbon flux in each sand‐fixing revegetated area displayed a unimodal curve, with the peak occurring between 12:00 and 14:00. Seasonal variation showed that spring > autumn > summer > winter, and soil carbon flux in spring differed significantly from that in summer, autumn and winter (P < 0.05); (2) The daily average soil carbon flux in different sand‐fixing revegetated areas was higher than that in bare sandy land, but the differences among vegetation types were not significant in summer (P > 0.05). The annual soil CO? emissions ranged from 543.92 to 881.30 g/m2; (3) Soil carbon flux was extremely significantly positively correlated with shallow soil temperature at 5 cm, surface temperature, and atmospheric temperature. The temperature sensitivity index (Q??) of soil carbon flux ranged from 1.92 to 2.66, and it was the most sensitive to variations in shallow soil temperature at 5 cm, with the diurnal variation of shallow soil temperature lagging behind that of atmospheric and surface temperatures; (4) Soil organic matter and shallow soil temperature were the primary factors influencing soil carbon flux, accounting for 65.4% of its variability, whereas the effect of soil moisture in the top 0–10 cm on soil carbon flux was not significant. This study demonstrated that sand-fixing revegetation promoted soil carbon cycling by improving soil organic matter and shallow soil temperature. The revegetation enhanced soil nutrients and hydrothermal conditions, thereby providing a pathway to increase the carbon storage capacity and potential of desert soils. These findings also provided a reference for research on soil carbon sequestration in desert ecosystems.