The invention relates to a high-performance thermoelectric converter. The converter comprises a hot plate, a condenser, a cylindrical thick hot wall, a reflux core, an evaporator, a plurality of base pipes and a heat insulator, wherein the hot plate is connected with a high temperature end; the condenser is connected with a low temperature end; the upper end of the thick hot wall is connected with the condenser in a sealed mode, and the lower end of the thick hot wall is connected with the hot plate in a sealed mode; the reflux core is arranged at the upper end of the axis of the thick hot wall and used for receiving a liquid working medium from the condenser; the evaporator is arranged at the lower end of the axis of the thick hot wall and used for receiving a liquid working medium from the reflux core and evaporating the liquid working medium into working medium steam by heating; and the base pipes are arranged at the periphery of the evaporator. The invention aims to provide the high-performance thermoelectric converter which reduces the heat loss of the high temperature end and improves the conversion efficiency of an alkali metal thermoelectric converter (AMTEC). The conversion efficiency and output power of the AMTEC are improved, and more stable and more reliable power output is provided for an external load.