The invention provides an automatic folding door. The automatic folding door comprises a control system, a door frame, a motor, a coupling, a worm rod, a worm wheel, a synchronous belt wheel component and a door body, wherein the door body comprises two or more door leaves; the door leaf positioned at one end of the door body is connected to the door frame through a hinge; the door leaf positioned at the other end of the door body is mounted with the synchronous belt wheel component through an iron foot component; the iron foot component comprises a first straight iron foot, an electromagnetic machine mounted at one end of the first straight iron foot for absorbing a synchronous belt in the synchronous belt wheel component, and a fastening component mounted at the other end of the first straight iron foot for connecting with the door body; and the working time sequences of the motor and the electromagnetic machine are controlled through the control system. The control system controls the electromagnetic machine to be absorbed on the synchronous belt or to be separated from the synchronous belt, so that the combination or the separation of transmission connection between the door body and the motor is realized, and the switchover between a manual mode and an automatic mode is realized.