Surface vegetation and soil properties are disturbed following forest fires, which may cause severe soil erosion. However, the effects of different years of restoration on soil detachment capacity (Dc) during natural recovery after a fire have not been well quantified, especially with respect to the accuracy of post-fire hydraulic parameters in predicting Dc. To fill this gap, this study examined continuous monitoring of high-severity fire forest land from October 2021 to April 2024, to assess the yearly variation in Dc after the high-severity fire. Flume scouring experiments were conducted on 225 soil samples from three slopes (17.6--57.7 %) and five flow discharges (0.8-4.0 L s(-1)) combinations. The results revealed that, 6 months after the fire, Dc was significantly increased by two times (p < 0.05). Dc increased by 48.79 %, 21.48 % and 12.26 % at 1, 2 and 3 years after the fire, respectively. The Dc of the burned areas gradually decreased with the increasing years of restoration, but it was still greater than that of the unburned areas. The key factors influencing Dc include the sand content, median soil particle size, and soil shear strength, whereas the bulk density and root mass density indirectly affect Dc through changing in other factors. Among the hydraulic parameters, stream power was the most effective parameter for predicting Dc. The estimation of Dc using the power function (R-2 = 0.81, NSE = 0.81) was better than the linear function (R-2 = 0.79, NSE = 0.77) overall. In the present study, we demonstrated that Dc increased significantly in the forest land after high-severity fire, with the level of Dc taking longer to fully recover. These results provide theoretical references for the sustainable management of forest ecosystems and the reduction of soil erosion.