An electric connection unit is provided. The electric connection unit includes a plug and a socket. The plug includes a plurality of plug contacts. The socket includes a plurality of socket contacts, wherein an opening is formed on a socket surface of the socket, and a sliding space is formed in the socket. The opening is communicated to the sliding space, and the socket contacts are disposed in the sliding space. The plug contacts are inserted into the sliding space of the socket through the opening, and the plug contacts are rotated between a first orientation and a second orientation. When the plug contacts are in the first orientation, the plug contacts are separated from the socket contacts, and when the plug contacts are in the second orientation, the plug contacts are electrically connected to the socket contacts.