Construction method of cornice formwork

The application relates to a construction method of a cornice formwork, and relates to the technical field of formwork supporting systems. The construction method solves the technical problems of troublesome operation, inconvenience in mounting and low rigidity of a frame body and the whole body in actual construction of an overhanging structure formwork. The construction method comprises the following steps that: S1, a quadrangular special-shaped supporting platform frame is mounted, the four-corner special-shaped supporting platform frame comprises a vertical beam, an upper cross beam is welded to the upper end of the vertical beam, a lower cross beam is welded to the lower end of the vertical beam, the upper cross beam and the lower cross beam are parallel to each other and are respectively perpendicular to the vertical beam, the length of the upper cross beam is larger than that of the lower cross beam, and an oblique beam is connected between the upper cross beam and the lower cross beam, one end of the