The invention discloses a private cloud system based on a smart TV and an implementation method thereof. The private cloud system comprises a smart TV, a mobile terminal, a storage device, and a smart home cloud server. The smart TV comprises a USB port, a BOA module, a WIFI module, and a network port module. The network port module and the WIFI module are connected with the USB port through the BOA module. The mobile terminal is connected with the smart TV through the network port module or the WIFI module. The smart TV is connected with the storage device through the USB port. The mobile terminal writes data into or reads data out from the storage device through the smart TV. A user can use a mobile hard disk conveniently and simply through a mobile terminal. A mobile hard disk not only can be used on a PC or a smart TV, but also can be used on a mobile terminal through a smart TV. Great convenience is brought to users.