The invention discloses a DC transformer topology for unipolar-to-true bipolar transformation, which is a DC transformer topology suitable for an application scenario in which the input side is unipolar and the output side is truly bipolar. In the process of unipolar-to-true bipolar transformation, the main problem is that load imbalance often occurs on the true bipolar side. Under such condition,imbalance of the output voltage can be easily caused, and the stable operation of the system will be affected. A DC transformer and power balance topology for unipolar-to-true bipolar transformationpresented by the invention is used to solve the problem of DC/DC voltage transformation under load imbalance. The design scheme is as follows: a power balance system is designed between the positive and negative poles of output, so that the unbalanced power is transmitted through the system and the voltage between the two poles can be balanced. The scheme can reduce the capacity design demand of the system and the construction cost of the system under the above scenario.