Rainfall infiltration is an important parameter that affects the performance change of unsaturated soils. In order to study the changes in the properties of sandy soils under different rainfall intensities with different durations, the changes in pore pressure, saturation, angle of internal friction, and cohesion of soils were analyzed under three rainfall intensities of 10mm, 50mm, and 100mm with durations of 0, 3, and 7 days, respectively, by using ABAQUS finite element software. The results showed that the changes in the parameters were not significant under 10 mm rainfall; When the rainfall lasted for 3 days and 7 days, the zero pore pressure increased by 3.3% and 16.67% under 50 mm rainfall, and by 6.67% and 30% under 100 mm rainfall; In terms of saturation, there was an increase of 150 percent and 180% under 50 mm rainfall, but saturation had not yet been reached, with less change in the deeper 2–3 m. Surface soils were saturated at 0–1 m in the top layer when rainfall of 100 mm lasted for 3 days, and all soils above the water table were saturated for 7 days. The angle of internal friction and cohesion in the initial state decreased gradually with the increase of depth and showed a trend of increasing and then decreasing after the rainfall, and the depth where the peak point appeared gradually shifted downward with the increase of rainfall intensity and duration.