The invention discloses a spacecraft bus router based on a component-based module, and relates to a spacecraft bus router, for solving the problem of low communication efficiency caused by communication difficulty among buses due to the mode of existence of the multiple buses of a conventional spacecraft. The bus router comprises a bus registration management module and an intermediate member data exchange module. The bus router respectively communicates with N components through the multiple buses, N being a positive integer. The bus registration management module is used for managing spacecraft bus registration, extracting bus component themes, managing component communication mapping tables among the buses according to the bus component themes and registering intermediate components. The intermediate component data exchange module comprises the multiple intermediate components for realizing data exchange among the intermediate components. The spacecraft bus router provided by the invention is mainly applied to information communication in a spacecraft field.