An intermodal transportation system, which obtains transportation plans that meet customer demand information through an input interface, a virtual network state diagram storage unit, a Dijkstra algorithm operation module, and a DFS algorithm operation module, and provides multiple transportation plans that meet the needs through an output interface. Provide customers with choices, and then, through the reservation interface, according to the transportation plan selected by the user, combine with multiple logistics platforms to reserve the journey of the corresponding time period. Therefore, the present invention can realize the comprehensive transportation plan planning of "five-in-one" of sea, land, air, iron and pipeline. The invention can integrate the advantages of various transportation modes, combine advantages, form a coherent transportation system, further shorten freight turnover time, simplify intermediate procedures, reduce logistics costs, and finally achieve the level of transportation standardization and rationalization.