The invention discloses a modular home cloud system and a control method thereof. The home cloud system comprises a transmission module, a business module and an authentication module, wherein the transmission module is used as a service interface for communication between the home cloud system and an authentication server as well as between the home cloud system and a client; the business module is used for providing services to the client, and carries out external communication through the transmission module; and the authentication module is used for processing commands of control messages of the home cloud system and routing equipment, and verifying the matching property of a control message protocol version. The system and the control method thereof provided by the invention have the advantages that networked smart terminals can be well identified, and various functions such as smooth file sharing, album backup and router network diagnosis can be performed; and the modular design facilitates tailoring, so that a router can be configured to achieve higher applicability for various high-end and low-end hardware.