[Objective] The amount of soil erosion at the spoil ground of the linear project-Pinglu Canal at different periods were evaluated and their erosion tendency was simulated. The relationship between slope and erosion intensity was explored to provide scientific reference for soil erosion control in the spoil ground. [Methods] The four spoil grounds of Pinglu Canal in Guangxi were selected as an example. The high-resolution photographic and topographic data of the spoil ground in different periods were obtained by using UAV low-altitude photography technology. The soil erosion tendency of the spoil ground was analyzed using GIS technology. The erosion factors were quantified and estimated by combining with the Revised Universal Soil Equation (RUSLE). [Results] (1) The soil erosion modulus of the four spoil grounds across different time points ranged from 1977.55 to 5748.96 t/(km2·a), with erosion intensity ranging from gentle to strong erosion. (2) Soil erosion modulus increased with slope, especially in areas with slopes of 8° to 25°, where soil erosion accounted for 76.8 to 86.4 % of the total erosion. (3) In inter-mound valley spoil grounds, the trickle flow was mainly along the higher land areas at the edges to the lowland areas. In sloped spoil ground, trickle flows were concentrated in the upslope portion of the stockpile area, towards the bottom of the slope. [Conclude] This study shows that slope was significant to the soil erosion of the spoil ground, and the slope area of 8–25° is the key area for soil erosion control. For the inter-mound valley spoil grounds, cutting the slope and arranging external drainage facilities are effective control measures. For sloped spoil ground, the construction of slope bottom drainage and sand sedimentation ponds should be strengthened. In addition, vegetation cover was a key factor in preventing soil erosion, especially in areas with favorable hydrothermal conditions, where it was more effective in reducing the risk of soil erosion.