Special supporting device for subway construction scaffold

A special supporting device for a subway construction scaffold is used for providing stable supporting for the scaffold in construction and ensuring construction safety. Comprising a left-side telescopic inclined strut, a right-side telescopic inclined strut, a cross rod and a telescopic horizontal strut, at least two transverse rods are vertically arranged at intervals, and the two ends of each transverse rod are connected with the telescopic inclined strut and the telescopic inclined strut on the right side through buckles to form a stable rectangular frame; the telescopic horizontal support is arranged on the lower portion of the left telescopic inclined support and the lower portion of the right telescopic inclined support, and the inner end of the telescopic horizontal support is hinged to the left telescopic inclined support and the right telescopic inclined support through buckles. The upper end of the left telescopic inclined strut, the upper end of the right telescopic inclined strut and the outer en