This invention discloses a corner peeling device, a film peeling apparatus, and a film peeling method, and relates to the technical field of liquid crystal panel manufacture, for the purpose of solving the problem concerning low efficiency in film peeling. The corner peeling device comprises: a movable rack; a roller pivoted on the upper part of the rack; an evacuating device in communication with the air channel; and an automatic revolving device, which is connected to the roller so that at the beginning of corner peeling and after corner peeling, the opening of the same sucking hole at one end of the plurality of the sucking holes arranged at intervals is upward. The corner peeling device is used for peeling a corner of a release film adhered to a plate-like substrate. The film peeling apparatus comprises the corner peeling device mentioned in the technical solution described above.