Abstract: A street lamp includes a housing, a plurality of light emitting units and a driving device supplying power for the light emitting units. The housing includes a first chamber and a second chamber located at an end of the first chamber. The first chamber and the second chamber are non-communicating. The light emitting units and the driving device are received in the first chamber and the second chamber respectively. A plurality of fins are formed on bottom of the first chamber. A plurality of convection holes are defined on periphery edges of the first chamber. The convection holes locate at an outside of the light emitting units.