The utility model provides a multi -functional pipeline welding assembly device, including base I, the one end of base I is connected with base II, the symmetry is provided with the four stand around the base II, the stand is 89 pipes of phi and diameter by the diameter and is 0 pole of phi four to six -tenehs and cup joints and form, the lower extreme welding of the pipe of stand has the backing plate, be connected with lift platform on the pole of stand, the last rotating circular disk that is provided with of lift platform, II centres of base also are provided with hydraulic pressure lift post, and the ejector pin of hydraulic pressure lift post is connected with lift platform. Set up a plurality of traverser on the base I, traverser can slip on base I. The utility model discloses an assembly wide range, many, the hands -off operati on of application functions. It can adjust platform height through the automation mechanized operation, owing to carry out the automation mechanized operation assembly, so can reduce intensity of labour, simultaneously automatic operating speed is fast, and assembly efficiency obtains improving, and economic benefits has had the remarkable improvement, simultaneously, product quality has also obtained the promotion.