The invention provides a method for improving the rolling stability of high-strength IF steel. Five F1-F5 cold rollings are adopted. Before rolling, rolling reduction allocation is adjusted to ensurethat the absolute reduction rate of an F2 rack is 80-85% of that of an F1 rack, and the absolute reduction rate of an F3 rack is 50-55% of that of an F1 rack. Working rollers of the F1-F3 racks are working rollers with convexity. Intermediate rollers have the roller shifting values that secondary set values are increased by 5-10%. The working rollers and the intermediate rollers have the roller bending values that are 10-30% of the secondary set values. Small-bending-force control is realized in a rolling process. The roller bending parameter can be adjusted within a wider space. After wave generation among the racks in the rolling process, plate shape adjustment can be rapidly performed. Stable rolling of strip steel is guaranteed. The operation is convenient. Rolling burst of strip steelor pulling scratch of the rollers are greatly reduced.