To explore the spatial differentiation characteristics of rill erosion, artificial rainfall experiments were used to analyse stimulate the rill erosion process of slope under different rainfall intensities and slopes, and the variation characteristics of rill erosion intensity and morphology along the slope direction were discussed. The results showed that with the increase of slopes and rainfall intensities, rill erosion was increasing. Under specific treatments, rill erosion intensity increased first and then decreased in space; the rill morphology parameters, such as rill width, rill depth and rill split degree, also increased first and then decreased in space, and the peak values appeared in the middle of the slope. Rill width and rill depth had a very significant positive correlation with the amount of rill erosion, and the evolution of rill erosion intensity and morphology was consistent. The runoff collection leaded to the increased power of runoff erosion in the middle of the slope, where the ditch wall collapse and undercut erosion were serious, and rill width and rill depth were enlarged. However, the rill erosion under the slope was lower due to the large amount of sediment concentration and the stable base level of soil erosion. Severe erosion tended to occur in the middle of the slope, so it was necessary to strengthen prevention and control measures or take measures to intercept and drain water. The research results could provide theoretical and technical support for the prevention and control of rill erosion.