The present application discloses a microchannel flat tube and a microchannel heat exchanger. The microchannel flat tube includes a flat tube body and a row of channels. The flat tube body includes a first plane, a second plane, a first side surface and a second side surface. The first plane and the second plane are arranged on opposite sides of the flat tube body in a thickness direction. The first side surface and the second side surface are arranged on opposite sides of the flat tube body in a width direction. The first side surface connects the first plane and the second plane. The second side surface connects the first plane and the second plane. The row of channels are arranged in the flat tube body along the width direction. The row of channels extend through the flat tube body along a length direction. The row of channels extend through the flat tube body along the length direction. The row of channels at least include a first channel, a second channel and a third channel which are arranged in a width direction. Cross-sectional areas of the first channel, the second channel and the third channel in the width direction change according to an exponential function.
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