A cover mechanism, comprising: a housing, provided with a receiving hole; and a movable member, configured to be movable relative to the housing in a first stroke between an initial position and a press position, and slidable relative to the housing in a second stroke when the movable member moves to the press position, wherein the second stroke has a first slide position for opening the receiving hole and a second slide position for covering the receiving hole; wherein the cover mechanism further comprises a drive portion, and the drive portion is configured to generate a driving force that positions the movable member to the first slide position or the second slide position; wherein the second slide position and the press position are a same position and the drive portion generates the driving force that positions the movable member to the second slide position, to move the movable member to the initial position; wherein the movable member comprises a cover plate and a slide panel; the cover plate is configured to be movable relative to the housing in the first stroke, and slidable together with the slide panel relative to the housing in the second stroke when the cover plate moves to the press position; and when the cover plate and the slide panel slide together to the second slide position, the cover plate is movable to the initial position; wherein a first guide rail protruding toward the slide panel is provided on an inner surface of the housing; when the cover plate and the slide panel slide together to the first slide position, the cover plate is slidable along the first guide rail; and when the cover plate and the slide panel slide together to the second slide position, the cover plate is detachable from the first guide rail; characterized in that a second guide rail protruding toward the slide panel is provided on the inner surface of the housing, and a protrusion distance of the second guide rail is longer than a protrusion distance of the first guide rail; and when the cover plate and the slide panel slide together to the first slide position or the second slide position, the slide panel is slidable along the second guide rail. a housing, provided with a receiving hole; and a movable member, configured to be movable relative to the housing in a first stroke between an initial position and a press position, and slidable relative to the housing in a second stroke when the movable member moves to the press position, wherein the second stroke has a first slide position for opening the receiving hole and a second slide position for covering the receiving hole; wherein the cover mechanism further comprises a drive portion, and the drive portion is configured to generate a driving force that positions the movable member to the first slide position or the second slide position; wherein the second slide position and the press position are a same position and the drive portion generates the driving force that positions the movable member to the second slide position, to move the movable member to the initial position; wherein the movable member comprises a cover plate and a slide panel; the cover plate is configured to be movable relative to the housing in the first stroke, and slidable together with the slide panel relative to the housing in the second stroke when the cover plate moves to the press position; and when the cover plate and the slide panel slide together to the second slide position, the cover plate is movable to the initial position; wherein a first guide rail protruding toward the slide panel is provided on an inner surface of the housing; when the cover plate and the slide panel slide together to the first slide position, the cover plate is slidable along the first guide rail; and when the cover plate and the slide panel slide together to the second slide position, the cover plate is detachable from the first guide rail; characterized in that a second guide rail protruding toward the slide panel is provided on the inner surface of the housing, and a protrusion distance of the second guide rail is longer than a protrusion distance of the first guide rail; and when the cover plate and the slide panel slide together to the first slide position or the second slide position, the slide panel is slidable along the second guide rail.