The invention discloses a rolling device capable of ensuring straightness of flanged edges of a cold-rolled formed product. The rolling device comprises two sets of flanged edge straightness regulating mechanisms which are separately mounted at the front side and the rear side of a roller wheel bracket, wherein each flanged edge straightness regulating mechanism comprises a regulating frame, lead screws, slide blocks and trimming roller wheels, the four lead screws are mounted on the regulating frame in parallel, each lead screw is in screw-thread fit to the corresponding slide block, each slide block is fixedly connected with a roller wheel mounting plate, each roller wheel mounting plate is assembled with one trimming roller wheel, the four trimming roller wheels comprise two vertical-axis trimming roller wheels and two inclination-axis trimming roller wheels, which are arranged in a staggered mode in a charge and discharge direction of the product. With the adoption of the rolling device disclosed by the invention, flange edge trimming of the product can be completed on the basis of not increasing product forming passes, and each trimming roller wheel is independently regulated to realize effective control on the straightness of the flanged edges at the two sides of the product, so that straightness requirements of the flanged edges of the product are met.