In order to study the effects of vegetation restoration on the composition and stability of soil aggregates in the water-level-fluctuation zone, dry screening and wet screening methods were used to determine the composition and distribution of soil aggregates in willow forest under different water levels and elevations in the water-level-fluctuation zone of Daqiao Reservoir, and fractal characteristics of soil aggregates were analyzed based on fractal theory. The results showed as follows:(1) The contents of non-water-stable aggregates and water-stable aggregates that greater than 0.25 mm in willow forest land in the water-fluctuation zone were 73.13%~93.69% and 47.62%~82.06%, respectively, which were higher than those of control plots without vegetation, but the difference between them was not significant. The content of macro-aggregates in water-level-fluctuation zone decreased with the increasing of water level elevation and depth of soil layer, however, there was no significant difference between different water levels and soil layers (p>0.05). (2) The fractal dimension (D) of soil water-stable aggregates in willow forest in the water-level-fluctuation zone ranged from 2.51 to 2.82, with an average of 2.67, which was lower than that of the control (2.75). The fractal dimension (D) of soil water-stable aggregates showed no significant difference between different water level elevations and different soil layers (p>0.05), and it decreased with the increasing of water level, and the D value of 0-10 cm soil layer was lower than that of 10-20 cm soil layer. (3) The average values of soil MWD and GMD of willow forest in water-level-fluctuation zone were 0.81 and 0.24 mm, respectively, which were higher than those of the control (0.71 and 0.15 mm). The stability of soil aggregates in willow forest was higher than control. The stability of soil aggregates had a certain spatial difference in the water-level fluctuation zone. Both MWD and GMD followed the order of high water level (2 016~2 019 m) > medium water level (2 010~2 013 m) > low water level (2 007 m), and the MWD and GMD in the 0-10 cm soil layer were both greater than those in the 10-20 cm soil layer. However, there was no significant difference between different water levels and different soil layers (p>0.05). In conclusion, vegetation restoration in the water-level-fluctuation zone of Daqiao Reservoir could improve soil aggregate structure to a certain extent, and the stability of soil aggregate in willow forest land in the water-level-fluctuation zone decreased with the increasing of flooding depth.