The invention provides a C2C, B2C, B2B social platform internet tourism method and system. The system comprises an online platform and an offline platform, the online platform is of a three-layer structure, which is respectively composed of a storage unit at the bottom layer, a processing unit at the middle layer and a service unit at the top layer, the online platform interacts with the internet to provide tourism service, and the offline platform is a platform which is assisted by entity service and interacts with the online platform. The method comprises the online platform for providing core service and the offline platform for providing auxiliary service, the method is used for establishing an interpersonal social network to provide information release and browse for supply and demand parties and providing such core services as intelligent supply and demand match, supply and demand relation analysis and big data analysis and the like, and the method can also be used for issuing people warning in traffic and scenic spots in time, so as to improve the operation efficiency of the tourism industry and related industries, while providing services for the tourism industry.