The invention relates to a hanger, comprising a lift bracket, a roll-over stand and a clamping rack; the lift bracket is connected with the roll-over stand by a revolute pair, the roll-over stand is connected with the clamping rack by a sliding pair, the clamping rack is used for clamping workpieces, the roll-over stand, the clamping rack and the workpiece are lifted by the revolute pair in the lift bracket; the roll-over stand can be overturned relatively to the lift bracket by the revolute pair; the clamping rack can move in a straight line relatively to the roll-over stand by the sliding pair.