Supporting device for cantilever formwork support

The supporting device comprises a connecting unit and a supporting unit, the connecting unit comprises an upper clamping groove and a lower clamping groove which are connected, the upper clamping groove is matched with the cantilever formwork support in an inserted mode, the lower clamping groove is matched with the supporting unit in an inserted mode, and the supporting unit is connected with a building floor. According to the utility model, the inclined struts are respectively connected with the overhanging formwork support and the building main body more quickly and conveniently, so that the time of high-altitude operation is effectively shortened, and the safety guarantee of construction is greatly improved; the supporting position of the supporting unit is convenient to adjust, the supporting position of the supporting unit can be adjusted only by sliding the upper clamping groove and changing the relative position of the upper clamping groove and the cantilever formwork support, and mounting and dismoun