The invention discloses a cold-rolled steel strip shape control method for actively preventing saturation phenomenon of an executer. The method comprises the following specific steps of: acquiring real-time position state data of a rolling mill transmission device on line, computing the strip shape regulating and controlling capabilities of a rolling mill in a current control period in combination with the strip shape regulating and controlling power coefficients of each transmission device, and laying a basis for effective filtering of uncontrollable components in strip shape deviations; andquickly filtering a strip shape deviation signal according to the strip shape regulating and controlling capabilities in the current control period, effectively separating controllable parts from uncontrollable parts in the strip shape deviation signal, designing a multi-variable optimization controller by using the controllable parts, computing the control regulating amount of the rolling mill transmission device, actively avoiding the saturation phenomenon of the executer, reducing wear of mechanical components of a control device, and realizing high-accuracy strip shape control over a cold-rolled steel strip. According to the method, the service life of a strip shape control device is prolonged, the problem of poor strip shape control effect is solved, and a portable means is provided for enhancing the cold-rolled strip shape control quality.