Abstract: The present application belongs to the technical field of mobile power supply, in particular to a small outdoor power bank, comprising a battery body, a sound control sensor, a control panel and an outer box with an internal space, the sound control sensor, battery body and the control panel are all installed in the internal space; the outer wall of the outer box is provided with an annual ambient light, and the annual ambient light, sound control sensor and battery body are all electrically connected with the control panel; and the annular ambient light is used for emitting different lights when the sound control sensor receives external sounds. The power bank of this application with ambient lights not only have the function of mobile power supply, but also can emit different lights along with music, thus improving the user experience of the small outdoor power bank.