The invention discloses an internal all-round floor-standing scaffold of a cylindrical structure. The scaffold comprises an inner well equal-span all-round scaffold body, an outer ring double-row floor-standing scaffold body, two-step two-span connecting rods, a stair unit and a connecting channel. The inner well equal-span all-round scaffold body is vertically arranged at the center of a cylinderbody and formed by constructing same layered structures, each layer is provided with horizontally and vertically staggered steel pipes to form a well lattice structure, and first steel plates are laid on the well lattice structures to form an inner well platform; the outer ring double-row floor-standing scaffold body vertically fits the inner wall of the cylinder body and is formed by constructing same layered structures, and second steel plates are laid on a double-row annular structure to form an outer ring platform; the two-step two-span connecting rods are arranged between the inner wellequal-span all-round scaffold body and the outer ring double-row floor-standing scaffold body, and the two ends of each two-step two-span connecting rod are connected with the inner well equal-span all-round scaffold body and the outer ring double-row floor-standing scaffold body respectively; the stair unit is located between the adjacent sides of the inner well equal-span all-round scaffold bodyand is of a Z-shaped stair structure. The connecting channel is horizontally disposed between the inner well platform and the outer ring platform, and the two ends of the connecting channel are connected with the inner well platform and the outer ring platform respectively.