The invention provides a multipurpose adjustable busbar welding support assembly which comprises multiple support units. Each support unit comprises a supporting plate, an adjusting pipe fitting, a supporting column and a base, wherein supporting frames are arranged on two sides of the supporting plate, movable rollers are fixed to the supporting frames, at least two pin holes are further formed in the width direction of the supporting plate, pins are movably connected in the pin holes, the supporting plate is connected with the supporting column through the adjusting pipe fitting, and the lower end of the supporting column is fixed to the base. The multipurpose adjustable busbar welding support assembly is suitable for tubular and rectangular busbar welding, a busbar to be welded can be stably arranged on the support assembly, the heights of the busbar and the support assembly are kept equal, arrangement time is effectively saved, and working efficiency is improved.