USB interface overflow warning indication system

The utility model discloses a USB interface over-current alarm indication system comprising a USB power source, a USB interface, and a USB control chip. A over-current signal is left between the USB power source and the USB control chip. The over-current alarm system also comprises the LBD arranged on the route of over-current signal. When the USB power source does not work normally or the USB interface is overloaded, over-current signal in circuit will become from high level to low level, making LBD sending out light to remind users of noticing the abnormities and taking corresponding measures, thus protecting electronic components connected through the USB interface.