Network central control system and control method thereof

The invention discloses a network central control system and a control method thereof. The network central control system comprises a central control mainframe, a display screen and a keyboard, wherein the outer surface of the central control mainframe is further provided with a VGA interface, a PS/2 interface and a USB interface; the central control mainframe is connected with the display screen through the VGA output interface, and the central control mainframe is connected with the keyboard through the USB interface or the PS/2 interface; the central control mainframe comprises a main controller, a storage, a CAN conversion module, an RS232 conversion module, an RS485 conversion module, an infrared conversion module and an I/O conversion module; the CAN conversion module comprises a CAN interface, the RS232 conversion module comprises an RS232 serial port, the RS485 conversion module comprises an RS485 interface, the I/O conversion module comprises an I/O interface, and each interface has a corresponding s