Frequency converter and cooling system thereof

The utility model discloses a frequency converter and a cooling system thereof, the cooling system comprises a water cooling cabinet, an air-water heat exchanger, a fan, a cooling air duct and a cooling water supply pipe, the cooling water supply pipe cools cooling water in the water cooling cabinet; the power unit heat exchange plate is subjected to heat exchange through cooled cooling water in the water-cooling cabinet so that cooling of the power unit can be completed, the cooling water supply pipe further provides cooling water for the air-water heat exchanger, the cooled cooling water in the air-water heat exchanger can cool air, and therefore the transformer can be cooled through the cooled air. Therefore, the cooling system of the frequency converter provided by the embodiment of the utility model can perform more targeted cooling on the frequency converter so as to improve the cooling effect of the frequency converter, thereby prolonging the service life of the frequency converter, and reducing the op