The invention relates to a power electronic transformer for a direct current distribution network and a control method of the power electronic transformer andbelongs to the technical field of power electronics. The power electronic transformer comprises a module connected between a high-voltage side and a low-voltage side of a direct-current distribution network and comprises a half-bridge moduleand a bidirectional direct-current conversion unit; the half-bridge module comprises an upper arm branch and a lower arm branch; the upper arm branch is connected with the lower arm branch; the lowerarm branch is arranged on the high-voltage side of the module; the bidirectional direct-current conversion unit comprises a primary side semiconductor conversion unit, a primary side resonance network, a transformer, a secondary side resonance network and a secondary side semiconductor conversion unit which are connected in sequence; and the secondary side semiconductor conversion unit is locatedon the low-voltage side of the module; and according to the power electronic transformer composed of two or more modules, the high-voltage sides of the modules are connected in series, the low-voltagesides of the modules are connected in parallel, and the high-voltage side of at least one half-bridge module is provided with a first inductor in series. According to the invention, voltage conversion between the high-voltage side and the low-voltage side can be achieved, and the power transmission efficiency is higher.