The invention relates to a novel active front-end controller topological structure which comprises a dual buck/boost type AC/DC converters and a DC CLLC resonant converter. The novel active front-end controller topological structure is characterized in that the dual buck/boost type AC/DC converters and the DC CLLC resonant converter serve as core constituent parts of an AFEC body topological structure and are formed by combining an input series-connection mode and an output parallel-connection mode, and mutual power conversion between a medium-voltage alternating-current power distribution network and a low-voltage alternating-current power distribution network is achieved by utilizing a power electronic technology and a high-frequency isolation technology. In addition, voltage regulation control is conducted on a low-voltage direct-current side busbar to achieve power balance of the medium-voltage alternating-current side and the low-voltage direct-current side. Functions of reactive compensation, active filtering, bidirectional power conversion and the like can be achieved according to different actual requirements. The novel active front-end controller topological structure can fully play the potential value of an active front-end controller, has high reliability and system efficiency and good modularity and meets different voltage class requirements.