The invention relates to a bending machine, in particular to a foldable bending machine for folding forming of wire-and-tube condensers and evaporators in the refrigeration industry. The foldable bending machine is provided with a bending element which consists of two bending arms connected by a hinge, the hinged part of the two bending arms is provided with a synchronizing gear, the other end of the two bending arms is hinged with slide blocks, each slide block is respectively hinged with a bending arm of two adjacent bending elements, each bending element is in end-to-end connection, the slide block can be arranged in a slide in a sliding way, and the slide block at the most front end is fixed with the slide, and the slide block at the tail end is driven by a drive device; the slide blocks hinged by adjacent bending elements are respectively provided with a clamping block for clamping a plane S-shaped pipe fitting elbow; a top-acting cylinder is arranged under the hinge part of the two bending arms between the adjacent slide blocks, a same clamping block is also arranged at the top-acting cylinder, and the drive device is fixed on a frame. The foldable bending machine of the invention has the advantages of replacing the manual folding, causing the bent workpiece to be more regular and uniform, stable quality, improving production efficiency and reducing labor intensity.