[Objective] This study investigated the effects of various ecological restoration technology models on plant and soil organic carbon density in the slopes of dumps in arid mining areas. It analyzed changes in organic carbon after ecological restoration, aiming to provide a scientific basis for selecting low-carbon, environmentally friendly restoration models. These models should align with national goals for ecological civilization and sustainable development, as well as support the monitoring of restoration outcomes. [Method] This study focused on vegetation and soil from the slopes of ecological restoration dumps at three open-pit coal mines (Mengtai, Xinxing, and Qifeng) in Wuhai City, Inner Mongolia. Through a combination of field sampling and laboratory experiments, the research analyzed vegetation organic carbon density, soil physicochemical properties, soil organic carbon density, and the correlations between vegetation indicators and soil factors. The aim was to provide a theoretical foundation for ecological restoration technologies and enhance the carbon sink capacity of mining areas. [Results] (1) As restoration years increased, vegetation organic carbon density showed an upward trend. Between 2 and 5 years, the growth rate ranged from 31.91% to 45.62%, while between 5 and 8 years, it ranged from 11.80% to 36.67%. Similarly, soil organic carbon content and density also exhibited an increasing trend. Between 2 and 5 years, the growth rate of soil organic carbon density ranges from 15.55% to 91.28%, and between 5 and 8 years, it ranges from 0.4% to 11.70%. (2) The ecological bar restoration technology model was the most effective for enhancing soil and vegetation organic carbon accumulation in dumps in arid mining areas. After 8 years of restoration, the soil organic carbon density reached a maximum of 66.70 t·hm?2, and the vegetation organic carbon density reached 1.85 t·hm?2. In contrast, the plant hedge restoration technology model was the least effective, with a soil organic carbon density of only 37.36 t·hm?2 and vegetation organic carbon density of 1.48 t·hm?2 after 8 years of restoration. After 5 years of ecological restoration, the vegetation-soil organic carbon densities for the gravel cover and wire stone cage models were 45.84 t·hm?2 and 44.98 t·hm?2, respectively. [Conclusion] Under the condition that the ecological restoration did not exceed 8 years, the soil-vegetation organic carbon density increased with the duration of restoration across the 7 ecological restoration technology models. The maximum value was achieved after 8 years of restoration, demonstrating a clear carbon sequestration effect. Among the different technologies, the hedge + ecological bag interception+ drainage technology+ sowing + sprinkler irrigation restoration method exhibited the least effective remediation..The three restoration technology models—ecological bar + ecological bag drainage interception + seeding + sprinkling irrigation; gravel cover + ecological bag drainage interception + seeding + sprinkling irrigation; and stone cage horizontal barriers + ecological bag drainage interception + seeding + sprinkling irrigation— were low-carbon and environmentally friendly technologies with excellent carbon sequestration effects. These models are suitable for broader application. Additionally, in the early stages of restoration, attention should be given to soil improvement and fertilization maintenance.