The southwest of China is located in a seismically active area, and in recent years earthquakes exceeding 7.0 magnitude have occurred in many locations in Yunnan and Sichuan provinces. In addition, the consequent stratified rock slope is developed well in the southwest of China, and this means that the strike and inclination direction of the slope is same as that of the rock stratum. Instability and failure of the consequent stratified rock slope is common during the construction of railways, highways, and water conservancy and hydropower engineering projects in the southwest of China. This is an urgent engineering construction problem which must be recognized and solved as soon as possible. Currently, there are certain researches being conducted on the seismic effects of this kind of slope, and the methods being used focus on the analysis of mechanical systems and model experiments. In these studies, the range of the rock stratum's dip angle is not sufficiently comprehensive and do not fully represent the seismic effects of dip angle of the rock stratum on the slope. Nor is the thickness of the rock layer in numerical simulations sufficiently precise, which affects the accuracy of the numerical simulation results. Using FLAC^3D software, in this study we simulated the consequent stratified rock slope for different dip angles of rock stratum(0°~90°) and detailed the thickness of the stratum(sandstone is 1 m thick, weak mudstone is 0.1 m thick) under seismic action. We then contrasted the regulation of the peak acceleration amplification factor, peak displacement, and shear strain increment after seismic action, and explored the impact of the rock stratum's dip angle on the seismic effect of the consequent stratified rock slope. This analysis will help to explain the instability mechanisms and slope failure modes, and lay the groundwork for disaster prevention in consequent stratified rock slopes. The study results are as follows:First, the peak horizontal acceleration amplification factor, which is relative to the slope toe, increases with increase in slope height, with the maximum occurring at the slope shoulder. This rule conforms to existing experimental conclusions. Then, under the effect of horizontal seismic action, slope horizontal peak acceleration amplification, which is relative to the initial seismic waves, decreases linearly with increase in the dip angle of the rock stratum. Second, when the dip angle of the rock stratum is less than the internal friction angle of weak rock stratum, the slope peak displacement is small and the influence of the dip angle is not obvious. When the dip angle of the rock stratum is larger than internal frictional angle of weak rock stratum, the slope peak displacement will increase at first and then decrease with increases in the dip angle. This displacement increases when the dip angle of the rock stratum is less than 30°, and decreases when the dip angle of the rock stratum is larger than 60°. Third, when the dip angle of the rock stratum is less than the slope angle, the maximum value of the slope residual shear strain increment after seismic action is concentrated in the soft rock in the middle and lower segments of the slope. When the dip angle of the rock stratum is larger than the slope angle, the maximum value of the residual shear strain increment after seismic action will be in the whole slope, thus forming an arc zone.