The invention discloses a mold for long-cylinder-shaped plastic thin metal frame processing. The mold comprises a concave mold and a convex mold fitting for use, wherein the concave mold includes two parts: a baseplate or a base and a concave mold upper body; the convex mold comprises a convex mold upper body, a support column and a base; when a long-cylinder-shaped plastic thin metal frame is processed, a material to be processed is put on the concave mold; the convex mold is mounted on pressure equipment; the pressure equipment drives the convex mold to apply the pressure to the material to be processed so as to realize the arc bending formation; and through two times of arc processing, the formation of the long-cylinder-shaped plastic thin metal frame is finished. The mold can reduce the prebending procedure, improve the production efficiency, save both labors and energy consumption and reduce the equipment loss, and is simple in bending operation, low in labor intensity, short in processing time, high in production efficiency, higher in product roundness precision and excellent in product batch consistency; and the special simple bending mold is simple in structure, lighter in weight, convenient for manufacturing, low in cost, convenient for operation and strong in practicability.