The invention provides a complex-section cold-formed steel roll bending forming method-UDT (USTB-Durable T) umbrella type angle control method, and belongs to the technical field of roll bending forming. According to the complex-section cold-formed steel roll bending forming method, in the roll bending forming process, vertical edge bending and eave edge bending of complex-section cold-formed steel are conducted at the same time, the bending angle of eave edges is larger than that of vertical edges, multi-pass continuous roll bending forming is conducted, and formed roll flowers are in an umbrella shape. The complex-section cold-formed steel roll bending forming method has the advantages of being efficient, savable in material and energy, high in product precision and the like; the problems that in the complex-section roll bending forming process, datum points of lightweight high-strength steel or ultra-high-strength steel and other plates and strips are prone to being offset, and edge wave quality defects are prone to occurring can be well solved; and a new method is provided for stably achieving high-precision roll bending forming of the complex-section cold-formed steel in a batched mode.