The present disclosure provides a smart space access method, a system, a controller, and a smart space interface server. The smart space access method includes: determining, by a controller that the controller enters a smart space in a smart space list; receiving a main mobile code corresponding to the smart space; and loading and executing the main mobile code, displaying a main service interface, generating a smart space request according to a service number of a selected application, sending the smart space request to the interface server, executing a result mobile code sent by the interface server, and displaying a processing result of the selected application. According to the present disclosure, access to different smart applications in different smart spaces can be implemented in a uniform manner by using a single controller without preinstalling a control program of a smart space, thereby providing a good expansibility.