The invention relates to an electrical rail folding door which comprises a left half of folding door and a right half of folding door; the folding door comprises an outer side door and an inner side door; the inner side door is fixed on a support piece through a first hinge, and the outer side door is arranged on the inner side door through a second hinge; the electrical rail folding door also comprises a guide mechanism, a ground rail, and a door closing motor for realizing extension; one end of the door closing motor is fixed on the support piece, and the other end of the door closing motoris fixed on the inner side door; the guide mechanism comprises guide wheels, guide wheel fixing rotating seats and a guide shaft; the two guide wheels are fixed on the guide wheel fixing rotating seats; the two guide wheels are respectively arranged on both sides of the ground rail and are connected with the side surface of the ground rail in a sliding way; the guide wheel fixing rotating seats are rotationally connected with the lower end of the guide shaft; and the upper end of the guide shaft is fixed on the bottom end of the outer side door. The electrical rail folding door has the groundrail with a simple structure and the guide mechanism can float vertically, and the operation is stable.