Formwork supporting device for high-altitude large-span I-shaped steel cantilever platform

The invention discloses a formwork supporting device for a high-altitude large-span I-shaped steel cantilever platform, and relates to the technical field of high-altitude cantilever construction. The formwork supporting device for the high-altitude large-span I-shaped steel cantilever platform comprises a supporting mechanism and further comprises a moving trolley, wherein the supporting mechanism is arranged on one side of the upper part of the moving trolley, a first gear column is arranged on the lower side of one end of the supporting mechanism, a first rotating column fixedly sleeves with the first gear column, and the two ends of the first rotating column are both fixedly connected to the end face of the supporting mechanism through first connecting plates; the first gear column is meshed with a second gear column in a groove in the top face of the moving trolley, and the two ends of a second rotating column fixedly sleeving in the second gear column are both rotationally connected to the moving trolle