Large multi-diameter pressure steel pipe rounding tool

The utility model discloses a large and multi-diameter pressure steel pipe rounding tool which is composed of two sets of shaping supporting frames which are connected through a detachable hand-drive block mechanism. Each set of shaping support frame is a plane steel structure frame, the plane steel structure frame is a combined structure formed by connecting a plurality of groups of H-shaped frames, the foot ends of the H-shaped frames at the two ends are connected with telescopically adjustable conversion joints through threads, and positioning clamps with groove structures are welded and fixed at the outer ends of the conversion joints; the chain hoist mechanism comprises a chain and a chain hoist connected with the chain in a penetrating manner; and the chain hoist mechanism is connected with the two shaping support frames through openable cleat hooks at two ends and lifting lugs which are respectively fixed at the centers of the planes of the two shaping support frames. According to the tool, the steel p