In the loess area of ??northwestern China, affected by the sudden water intensity of the loess, shallow loess landslides are widely distributed and frequent, landslides caused a large number of casualties and property losses. Usually rainfall and earthquakes are the most frequent and active triggers for loess landslides. In recent years, a large number of loess landslides have been induced by the coupling of rainfall and earthquakes on the Loess Plateau. Although the coupling effect of earthquake and rainfall will seriously aggravate the instability probability and disaster risk of shallow loess landslides, there is still a lack of quantitative disaster evaluation research on such landslide events. Therefore, this paper takes the shallow loess landslide in the Dashagou watershed of Lanzhou City as the research object, integrates the rainfall penetration model into the three-dimensional deterministic model of the loess slope, and evaluates the stability of the shallow loess landslide in the study area with different rainfall and seismic coupling effects. Method and ROC curve method to evaluate the results of stability evaluation prediction. The results of this study found that the integration of a three-dimensional deterministic model of rainfall infiltration and earthquake effects has a good effect on the stability evaluation of shallow loess landslides at the watershed scale, and can be used as a tool for the assessment and early warning of rainfall and earthquake-induced loess landslides. It is of great reference value to strengthen the spatiotemporal disaster assessment and prediction of loess landslide disasters under different scales of extreme events.