The invention provides a continuous bending forming method for the inside of the roller pressing surface of a uniform-thickness arc part. An upper work roller with a boss-shape surface and a lower work roller with a groove-shape surface are taken as a forming tool, continuous roller pressing is conducted on plate strip blank with the trapezoid cross section, the plate strip blank is subjected to uneven compression in the width direction, therefore the plate strip blank generates extending and deformation which are distributed unevenly in the width direction, and after compression, the inside of the generating surface of the a plate strip is subjected to lateral bending; by reasonably designing the distribution of elongation, after roller compressing deformation, the plate strip blank is subjected to continuous lateral bending, and finally, the uniform-thickness arc part is formed; the radius of the arc part is controlled by geometrical parameters of the section of the plate strip blank. According to the method, the required shaping force is small, the equipment structure is simple, the cost is low, efficient and low-cost processing for arc parts can be achieved, and the utilizationrate of materials is increased.