Smart home security system and control method thereof

The invention discloses a smart home security system. The smart home security system comprises a door lock mechanism, a video monitoring mechanism and a central controller; the door lock mechanism comprises a lock body, a lock cylinder is installed in the lock body, an electromagnet is installed in the lock body, the front end of the electromagnet is connected with a ferromagnetic safety pin through a spring, a square hole is formed in the bottom face of the ferromagnetic safety pin, a limiting pin is arranged on the lock cylinder, the square hole is matched with the limiting pin in an inserted mode when the electromagnet is not powered on, the ferromagnetic safety pin is attracted by the electromagnet to enable the square hole to be separated from the limiting pin when the electromagnet is powered on, and an electric control unit of the electromagnet is in communication connection with the central controller; and the door lock mechanism further comprises a plurality of keys matched with the lock cylinder, RF