USB flash disk

The utility model discloses a USB flash disk. The USB flash disk is composed of a USB flash disk body, an LED lamp, a mirror plane ball, a connecting rod and a fluorescent powder layer and is characterized in that the surface of the USB flash disk body is coated with the fluorescent powder layer, the LED lamp is arranged in the middle of the upper end of the USB flash disk body, and the mirror plane ball is arranged at one side of the LED lamp on the USB flash disk body, is connected with the USB flash disk body through the connecting rod and can rotate around the connecting rod. When using the USB flash disk, a user turns off lamps in a room and inserts the USB flash disk body into a computer or a loudspeaker or other electronic devices which the USB flash disk can be inserted into, the LED lamp is lighted and projects light to the mirror plane ball, finally the user exerts force with a finger to poke the mirror plane ball to rotate around the connecting rod, at the same time, the light is projected to the fluorescent powder layer by the mirror plane ball to make the USB flash disk body emit weak light, and therefore the USB flash disk is convenient to find. The USB flash disk has the advantages of being simple in design, low in cost, reliable, durable and high in practicability.