The disclosure provides a lockable socket, which includes a body, a rotatable assembly and an prong receiving member. The prong receiving member is provided with a guide hole, a fixing pin is disposed in the guide hole and extends through a first spring. Guide chutes matching with the fixing pins are provided on the inner surface of the body. The lockable socket of the disclosure, which has a simple structure and is easy to use, can effectively prevent the plug including prongs with openings from being released from the socket due to an unexpected external force or a loose connection between the plug and the socket.