USB (universal serial bus) interface mode switching device and intelligent terminal

The invention discloses a USB (universal serial bus) interface mode switching device and an intelligent terminal, and belongs to the field of the computer. The USB interface mode switching device is applied to the intelligent terminal. The intelligent terminal comprises a chip set, an external USB interface and an internal USB unit. The USB interface mode switching device comprises a switching circuit, a USB concentrator and a control module. The switching circuit comprises two input terminals and two output terminals, the two input terminals are respectively connected with two USB interfaces of the chip set, the two output terminals are respectively connected with the external USB interface and the USB concentrator, and the USB concentrator is connected with at least one internal USB unit. The control module is used for detecting fine-definition multimedia interface signals or intelligent terminal modes, and controls the switching circuit to connect the chip set with the external USB interface and the USB concentrator according to the detection result, or connects the external USB interface with the USB concentrator.