A connector mechanism includes a base, a cover and a resilient component. An opening is formed on the base, and an external plug can inset into the opening. The cover is pivotably disposed on the base. The cover includes a first portion, a second portion and an axle. The first portion rotates to a first position for covering the opening, and further rotates to a second position to hold a body of the external plug. The second portion includes a buckling structure for buckling a pin of the external plug when the first portion rotates to the second position, so as to constrain a movement of the external plug relative to the base. Two ends of the resilient component respectively contact against the base and the cover, and the cover can cover the opening via a resilient recovering force of the resilient component.