A power socket includes a socket main body, a front cover and a safety gate mechanism. The front cover has two openings. The safety gate mechanism includes a casing and a safety gate. The casing located between the socket main body and the front cover has two inserted holes and a protrusion. The inserted holes are aligned with the openings. The safety gate slidably disposed at the casing is dislocated from the protrusion. When the safety gate is at a first position, the safety gate blocks the inserted holes, and two terminals of a plug push the safety gate through the two openings to make the safety gate slide to expose the inserted holes. When an object pushes the safety gate through one of the openings, the safety gate rotates to drive a part of the safety gate to be aligned with the protrusion to avoid exposing the inserted holes.