The utility model discloses a pipeline welding anti-deformation platform which comprises at least two platform units, each platform unit comprises a supporting device and a fixing device, each supporting device comprises two height-adjustable supporting rods and a cross beam transversely and horizontally fixed to the tops of the two supporting rods, and the cross beams are provided with strip-shaped screw holes in the length direction of the cross beams. The fixing device comprises a strip-shaped upper-layer fixing plate and a strip-shaped lower-layer fixing plate, upper arc plates matched with the to-be-welded pipeline in boundary dimension are arranged on the bottom surface of the upper-layer fixing plate at intervals, and lower arc plates matched with the upper arc plates are arranged on the top surface of the lower-layer fixing plate at intervals; the upper-layer fixing plate, the lower-layer fixing plate and the cross beam are connected through at least one bolt penetrating through the upper-layer fixing plate, the lower-layer fixing plate and the cross beam. The platform can effectively fix a to-be-welded pipeline, the height can be adjusted left and right according to actualworking requirements, the application range is wide, and pipeline welding deformation can be effectively prevented.