The Neoproterozoic Datangpo stage manganese depositslie in the Songtao region, Guizhou Province with four worldclass manganese deposits.The accumulated proven manganese resources amount to 700 million tons, which formed a significant manganese ore concentrated area in China. However, the geological conditions that could lead to such a huge amount of manganese enrichment mineralization and the source of its mineralized material have not been unified for a long time. In this paper, by analyzing the background of Mn content in the Banxi Group and syngenetic submarine volcanic rocks, it is concluded that the basal Banxi Group and volcanic rocks have high Mn content (0. 16%), and the weathered crust of the Banxi Group has higher Mn content (0. 88%). Meanwhile, the contemporaneous islandarc basalts in the Banxi Group contain even higher MnO (0. 25%), and they may be the source layer for manganese ore formation, which is an important basis for the formation of huge amounts of manganese deposits. Integrated the relationship between the evolution of the Jiangnan orogenic belt, Rodinia supercontinental disintegration and manganese mineralization is considered that the orogenic extrusion metamorphism of the Jiangnan orogenic belt caused the activation and migration enrichment of manganese in the Banxi Group and island arcbasalts, while the tensional rifting caused by Rodinia supercontinental disintegration (650 Ma) caused the manganeserich metamorphic fluids along the fracture entered to the seafloor and formed a large number of manganese deposits.