A connector mechanism includes a first casing, a second casing, a rotary cover, a circuit board, a socket, a base, a rotary fastener and a resilient component. The rotary cover is connected to the second casing in a rotable manner. The rotary fastener is pivoted to the base. The rotary fastener is pressed by the rotary cover when the rotary cover rotates to a close position. The rotary fastener fastens a plug when the rotary cover rotates to an open position so as not to press the rotary fastener and when the plug is inserted into the socket. The resilient component is connected to the rotary fastener for driving the rotary fastener to fasten the plug when the rotary cover rotates to the open position.