Abstract: The basin group on the passive continental margins on both sides of the South Atlantic is one of the regions with the most abundant oil and gas resources in the world and is also a hot spot of oil and gas exploration in the world today. With the advancement of oil and gas exploration, the increasing of seismic, gravity and magnetic data provides a basis for the study on the structural segmentation and the development law of the basins on both sides of the South Atlantic. Study starting from the tectonic settings of the South Atlantic region, then screening the geophysical and geological sections of the basin groups, and combining the crustal-scale sections with the basin-scale sections, four long structural sections across the basins have been mapped along the transform faults, which are located in the northern, central and southern parts of the South Atlantic. The comparison of the sections at different scales in the same basin shows that plate movement and crustal thinning modes determine the structures of continental shelves and continental slopes, control the development of basins and make the development of strata on the background of gravity. The comparison among the four long structural sections shows a segmental difference in the tectonic features of the basins on both sides of the South Atlantic, but they have similar tectonic evolution stages, and the basins on both sides have an obvious conjugate relationship. The South Atlantic was open from south to north, and according to the primary structural features, three segments of passive continental margins and four types of basins are divided, namely the southern magmatic basins, the central salt-structural basins, the central mud-structural basins, and the equatorial transformed basins.