The invention provides a public opinion topic propagation path analysis system based on multi-source data, and the system comprises: a multi-source data collection module which is used for carrying out the multi-source data collection of public opinion topics, and obtaining at least one piece of source information; a propagation path analysis module which is used for adopting different single-source propagation path establishment schemes according to the types of the source information to obtain single-source propagation paths, wherein the multiple single-source propagation paths are associated with one another to obtain cross propagation paths; a propagation main path analysis module which is used for analyzing the forwarding relationship and the forwarding amount of each node to obtain key propagation nodes of the public opinion topic, reserving propagation paths between the root node and the key propagation nodes and between the root node and the key propagation nodes, and deletingirrelevant paths to obtain a propagation main path; and a path display module which is used for displaying the path information. The invention further provides a public opinion topic propagation pathanalysis method based on the multi-source data, and the method helps a user to know the propagation situation of the public opinion topics more visually.