A battery cover mechanism includes a housing, a battery cover and a releasing assembly. The housing has a first surface and at least one latching hook disposed thereon. The battery cover defines a notch therethrough corresponding to the latching hook of the housing and is detachably assembled with the housing by the releasing assembly. The releasing assembly includes a fixing base, an elastic piece and a releasing piece. The fixing base is mounted on the inner side surface of the battery cover and there form an assembling space together with the notch. The elastic piece is mounted on the fixing base and the releasing piece is slidably mounted on the fixing base. The releasing piece is slidably mounted on the fixing base to slidably resist the elastic piece to make the elastic piece release from the latching hook.