The invention relates to a stacking and shaping mechanism for multiple steel pipes. The stacking and shaping mechanism comprises a U-shaped material receiving rack and a sliding rod support. The U-shaped material receiving rack and the sliding rod support are connected. The sliding rod support is provided with a sliding rod. Shaping plates used for shifting along the sliding rod are arranged on the sliding rod. Each shaping plate is provided with a swing arm used for pushing the corresponding shaping plate to shift. The swing arms are connected with an air cylinder. An elastic rope is arranged on each shaping plate. The stacking and shaping mechanism has the beneficial effects that due to the arrangement of the elastic ropes, in the process of gathering the shaping plates, the steel pipes of different numbers or diameters can be bundled to be roughly round, parts do not need to be replaced, no clearance exists between the steel pipes, and therefore the steel pipes cannot be loose after being bundled; the U-shaped material receiving rack achieves bend forming, welding is not needed, and machining is simple; and the surface of the U-shaped material receiving rack is sleeved with a rubber sleeve, and therefore the steel pipes cannot be damaged when falling off.