The West Congo orogenic belt is the African part where the S ? o Francisco and Congo cratons converged and collided during the Pan Africa period, and its tectonic evolution has attracted much attention from scholars both domestically and internationally. Conducting research on the stratigraphy of this period is of great significance for exploring the tectonic evolution of the orogenic belt. This study selected the Inkisi Formation sandstone in the foreland basin of the eastern margin of the orogenic belt in northwestern Angola as the research object, and conducted research on chronology and petrology. The results indicate that the minimum detrital zircon age in the Inkisi Formation sandstone is 588 ± 3.0 Ma, and the discrimination diagram indicates that the sandstone was formed in a sedimentary basin under a collision background. The chemical alteration indices (CIA, CIW, PIA) of Inkisi sandstone are 63.34~73.17, 70.82~92.29, and 65.19~89.56, respectively, indicating that the source area was under warm and humid paleoclimatic conditions, and the source rocks underwent low to moderate weathering. A large number of flowing sedimentary structures are developed in the sandstone, with Sr/Ba values ranging from 0.07 to 0.24<0.5. The grain size analysis results show the characteristics of river sedimentation, which collectively indicate that the sandstone was formed in a river sedimentary environment. Based on the results of rock geochemistry, geochronology, and detrital component analysis, this article believes that the Inkisi Formation sandstone in the study area was formed in a basin related to collision environments under the background of active continental margins, which is a response to the West Congo orogeny during the Pan Africa period. It also suggests that the West Congo collisional orogeny continued during the Ediacaran Early Cambrian period.