Aimed at the issues of a long dynamic tracking time and secondary oscillation during load disturbances in interleaved parallel converters, a variable bandwidth active disturbance rejection control strategy is proposed. First, based on the small-signal model analysis, the influence of parasitic parameter perturbations is taken into account in the transfer function, so as to eliminate internal uncertainty disturbances caused by parasitic parameters. Then, starting from the frequency-domain characteristics, the relationship between bandwidth and anti-interference capability is analyzed in terms of stability and anti-interference characteristics. Finally, Monte Carlo experiments were used to test the robustness of the proposed strategy. Simulation and experimental results show that the proposed strategy is superior to double closed-loop proportional-integral (PI) control in target value tracking and anti-interference quality, thus improving the system’s dynamic performance and anti-interference capability.