A power outlet includes a base and sliding covers. The base has conductive terminals for electrically connecting to terminals of a power line. The conductive terminals are partially exposed from the base and a pair of first guiding portions arranged in parallel to each other is disposed on each side of the base exposing the conductive terminals. Each of the sliding covers has second guiding portions capable of sliding with and engaging with the corresponding first guiding portions so as to allow the sliding covers to slide relative to the base, thereby shielding the exposed portions of the conductive terminals and preventing accidental touching of the exposed portions of the conductive terminals by a user and thus avoiding the risk of electric shock.