An electronic device includes a housing defining a receiving space framed by a plurality of side walls with an opening defined on a top surface of the housing. A cover is movable relative to the top surface. A connecting mechanism connects the housing with the cover. The connecting mechanism includes a transmission apparatus received in the housing and is exposed out of the housing via the opening, engaging with the cover, a moveable position apparatus is assembled with the transmission apparatus moving along the transmission apparatus, a latching apparatus is arranged on one side wall of the housing to latch the position apparatus. When the cover is moved to a first side of the housing, the position apparatus latches the latching apparatus. When the latching apparatus is released from the position apparatus, the cover slides to a second side opposite to the first side of the housing automatically.