Abstract: In order to improve the stability of distribution network, this paper proposes to use power electronic transformer to regulate the voltage and frequency of distribution network. The input stage of power electronic transformer is used to regulate the reactive power of distribution network. A reactive power regulation method is proposed based on the voltage droop characteristic, and the reactive current feedback is introduced to improve the voltage quality and stability of distribution network. At the same time, the load voltage is controlled by the output stage of the power electronic transformer to regulate the active power of the distribution network as a primary frequency regulation reserve load, thus reducing the frequency deviation during the frequency transient. Through the experimental verification of the voltage and frequency regulation control method based on power electronic transformer of the distribution network, the proposed control strategy can improve the voltage and frequency quality of the distribution network, and effectively enhance the stability of the distribution network.