The invention discloses a rectifying and inverting unit cabinet of a megawatt-level wind-power converter, which comprises a cabinet body, a rectifying unit, an inverting unit, a first centrifugal fan, a second centrifugal fan, a first water cooling pipe and a second water cooling pipe. A first IGBT (insulated gate bipolar translator) module and a first capacitance matrix in the rectifying unit are arranged on a first surface of a first bottom plate, the first bottom plate, a front plate and a back plate of the cabinet body and a first side plate surround to form a first air duct, a second IGBT module and a second capacitance matrix in the inverting unit are arranged on a first surface of a second bottom plate, the second bottom plate, the front plate and the back plate of the cabinet body and a second side plate surround to form a second air duct, a second surface of the first bottom plate and a second surface of the second bottom plate are opposite and are spaced to form a bottom plate gap, and the first water cooling pipe and the second water cooling pipe are arranged in the bottom plate gap and are used for cooling the first IGBT module and the second IGBT module respectively. The rectifying and inverting unit cabinet of the megawatt-level wind-power converter in the embodiment is compact in structure, small in size and fine in heat radiation effect.