The invention relates to a control method for an interleaved parallel bidirectional DC converter for a DC microgrid system. The method comprises the following steps of: 1, comparing the sampled outputvoltage of a high-voltage side with a given voltage, processing a voltage difference by a PI processor to obtains a total current reference, comparing the sampled low-voltage side current with the total current reference, and processing a current difference by another PI processor to obtain a total duty ratio reference D; and 2, allocating the total duty ratio reference D obtained in the step toeach phase duty ratio, and controlling the two duty ratios by monitoring two inductor currents. The method can automatically adjust the duty ratio of each phase current to achieve a current sharing effect under the premise that the total low-voltage side current is constant.