An automatic warehouse, comprising: a frame, defining a prismatic-shaped containment volume, with a vertical axis; an elevator, arranged inside the containment volume, comprising a platform, movable along a vertical direction; a locking device, interposed between the frame and the elevator, which is operable between a locking configuration, in which the elevator is constrained to the frame with respect to the vertical movements and is unable to move vertically, and a release configuration, in which the elevator is able to move vertically; wherein the locking device comprises at least one support member, connected to the frame so as to be able to support the weight associated with the platform; in the locking configuration, the support member has a first portion, constrained to a first point of the platform, and a second portion, spaced apart from the first portion, constrained to the frame and/or to a second point of the platform, so that the platform is locked with respect to the sliding along the vertical axis and the weight of the platform is supported by the frame by the support member; in the release configuration, the support member isn't constrained to the platform or it isn't constrained to the frame, to allow a free movement of the platform along a vertical direction; characterized in that the support member is flexible. a frame, defining a prismatic-shaped containment volume, with a vertical axis; an elevator, arranged inside the containment volume, comprising a platform, movable along a vertical direction; a locking device, interposed between the frame and the elevator, which is operable between a locking configuration, in which the elevator is constrained to the frame with respect to the vertical movements and is unable to move vertically, and a release configuration, in which the elevator is able to move vertically; wherein the locking device comprises at least one support member, connected to the frame so as to be able to support the weight associated with the platform; in the locking configuration, the support member has a first portion, constrained to a first point of the platform, and a second portion, spaced apart from the first portion, constrained to the frame and/or to a second point of the platform, so that the platform is locked with respect to the sliding along the vertical axis and the weight of the platform is supported by the frame by the support member; in the release configuration, the support member isn't constrained to the platform or it isn't constrained to the frame, to allow a free movement of the platform along a vertical direction; in the locking configuration, the support member has a first portion, constrained to a first point of the platform, and a second portion, spaced apart from the first portion, constrained to the frame and/or to a second point of the platform, so that the platform is locked with respect to the sliding along the vertical axis and the weight of the platform is supported by the frame by the support member; in the release configuration, the support member isn't constrained to the platform or it isn't constrained to the frame, to allow a free movement of the platform along a vertical direction; characterized in that the support member is flexible.