The invention relates to a high-power converting module, wherein an IGBT (Insulated Gate Bipolar Translator) module, a heat radiation fan and a capacitor bank are packed in a shell; AC (Alternating Current) and DC (Direct Current) end interfaces, an IGBT module control interface and a power supply interface of the heat radiation fan are arranged on the shell; all the interfaces are insulated withthe shell; a heat radiation board of the IGBT module and the capacitor bank are parallelly fixed on the upper part of the shell; the heat radiation fan is fixed in the shell arranged below the IGBT module; the capacitor bank comprises a buffer capacitor and a support capacitor; the buffer capacitor and the support capacitor are parallelly connected with the direct current end of the IGBT module; the alternating current end of the IGBT module is connected with the alternating current end interface through a bus, and the direct current end of the IGBT module is connected with the direct currentend interface through the bus; a working power supply of the heat radiation fan is supplied by the power supply interface of the heat radiation fan; heat radiation vent holes are arranged on the shell corresponding to the arrangement position of the IGBT module; air intakes are arranged on the shell corresponding to an air entry of the heat radiation fan; and an air outlet of the heat radiation fan points to the heat radiation board of the IGBT module.