［Objective］ The effects of various ecological restoration technology models on plant and soil organic carbon density in the dump slopes in arid mining areas were investigated， and the changes in organic carbon after ecological restoration were analyzed， in order to provide theoretical basis for promoting ecological restoration technology and enhancing the carbon sequestration capacity of mining areas. ［Methods］ Vegetation and soil samples from the ecological restoration slopes of waste dumps in three open-pit coal mines （Mengtai， Xinxing， and Qifeng） in Wuhai City， Inner Mongolia Autonomous Region， were selected as research subjects. Field sampling and laboratory experiments were conducted to analyze vegetation carbon density， soil physicochemical factors， soil carbon density， and the correlation between vegetation indicators and soil factors. ［Results］ ① With the increase in restoration years， vegetation organic carbon density showed an increasing trend. The growth rate ranged from 31.91% to 45.62% from two to five years and from 11.80% to 36.67% from five to eight years. Soil organic carbon content and density also exhibited an increasing trend. The growth rate of soil organic carbon density ranged from 15.55% to 91.28% from two to five years and from 0.4% to 11.70% from five to eight years. ② The ecological rod restoration technology model showed the best results in improving the soil and vegetation organic carbon accumulation in waste dumps in arid mining areas. After eight years of restoration， the soil organic carbon density reached a maximum of 66.70 t/hm²， and the vegetation organic carbon density reached 1.85 t/hm². In contrast， the plant hedge restoration technology model performed the worst， showing soil organic carbon density of only 37.36 t/hm² and vegetation organic carbon density of 1.48 t/hm² after eight years of restoration. At five years of ecological restoration， the vegetation-soil organic carbon density for gravel cover and wire gabion were 45.84 t/hm² and 44.98 t/hm²， respectively. ［Conclusion］ Under ecological restoration for no more than eight years， the vegetation-soil organic carbon density increased with the restoration years and reached its maximum at eight years， demonstrating significant carbon sequestration effects. The plant hedge + ecological bag interception and drainage technology + sowing + sprinkler irrigation restoration model performed the worst. The ecological rod + ecological bag interception and drainage technology + sowing + sprinkler irrigation， gravel cover + ecological bag interception and drainage technology + sowing + sprinkler irrigation， and gabion-horizontal barrier + ecological bag interception and drainage technology + sowing + sprinkler irrigation models were low-carbon and environmentally friendly restoration technologies with good carbon sequestration effects， making them suitable for promotion and application. Additionally， soil improvement and the maintenance of fertilization should be emphasized during the early stages of restoration.