A street light allows an electronic device installed therein to work properly. The street light has an internal chimney structure for dissipating heat from the electronic device and preventing any liquid from flowing into a space where the electronic device is accommodated. This allows the street light to internally provide both a dry environment and a heat dissipation mechanism for the electronic device, without closing an internal space of the street light, so as to greatly improve the above undesirable structural drawbacks of the conventional street light.