An automatic revolving door having a plurality of foldable revolving wings, in which each revolving wing is disposed at a lower side of a horizontal plate which is driven by a driving motor, and an upper outer side of each revolving wing is coupled with hinge to the horizontal plate, and an upper inner side of each revolving wing is slidably coupled to a cross bar attached to the horizontal plate, and each revolving wing is pivotally moveable toward outer wall members of the door to provide a wide opening between the outer wall members.