Abstract: The large power system, numerous microgrids, blurred network boundaries, and complex, diverse operation environments make the security threats of traditional urban power grids increasingly serious. In order to meet the development requirements of new-type urbanization and make up for insufficient timeliness of online updating of power equipment encryption keys, this paper studies the practical technology and core service characteristics of power quantum secret communication. A new generation of power quantum secure communication framework with high-security level protection is proposed to improve security level of electricity information transmission. The performance test of the proposed scheme is conducted based on the actual urban power transmission line and test environment. The results show that the proposed method can meet the operation requirements of the electricity business. Moreover, it can effectively improve the security protection capability of power grid.