The invention discloses an application platform system of a tobacco commercial system, which comprises an access layer module, a presentation layer module, a service application layer module, a flow integration layer module, an application integration layer module, a data integration layer module, an application support layer module and a foundation support layer module, wherein the access layer module is used for uniformly providing an access service by utilizing a door component of an application platform; the representation layer module is used for uniformly assembling and representing all functions of each application system of the tobacco commercial system based on the functions of the application door component; the service application layer module is used for splitting application into components to form an application component pond; the flow integration layer module is used for providing an enterprise service bus and a service flow integration engine; the application integration layer module is used for realizing the component-based development of the application system; the data integration layer module is used for realizing the integration of the application on a data layer, uniformly managing basic service data, such as service codes and the like, realizing metadata management and data standardization, improving data quality, normalizing and realizing a data exchange and sharing mechanism, and establishing a database and a data quality management system; the application support layer module comprises a basic application server, a database server and message middleware software; and the foundation support layer module is used for providing server equipment, various infrastructures and matched system monitoring and management system software.