The utility model relates to a replacement joint, in particular to a replacement joint with an ultra-long X-shaped circular tube intersecting weld joint, and belongs to the field of steel structures.The device comprises a cross-shaped longitudinal plate frame, end plates fixed to the longitudinal frame are arranged on the two side walls of the longitudinal plate frame respectively. a semi-arc plate fixed with the end plate is sleeved outside the longitudinal plate frame; the longitudinal plate frames, the end plates and the semi-arc plates form a whole; wherein a longitudinal plate is arranged on the outer side wall of the end plate, cover plates are respectively arranged at the upper part and the bottom of the longitudinal plate, the longitudinal plate and the two cover plates form an outer end frame with an H-shaped section, a semi-arc sleeve is sleeved outside the outer end frame, a cover plate is arranged on the side wall of the outer end of the outer end frame, and two rod piecesextending outwards are arranged in the cover plate. The X-shaped circular pipe intersecting weld joint ultra-long replacement joint is compact in structure, convenient to operate and firmer in structure.