Device and method for testing microwave emissivity of radiometer antenna

The invention discloses a radiometer antenna microwave emissivity testing device which comprises a first cascade thermal control coating test piece, a second cascade thermal control coating test piece, a vacuum high-temperature radiation source, a vacuum low-temperature radiation source, a vacuum variable-temperature radiation source, a receiving assembly, a position control mechanism and a temperature controller. The first cascade thermal control coating test piece and the second cascade thermal control coating test piece are arranged in the temperature controller, and the receiving assembly is arranged on the position control mechanism; the position control mechanism controls the receiving assembly to periodically reach a preset position so as to receive signals emitted by the vacuum high-temperature radiation source, the vacuum low-temperature radiation source and the vacuum variable-temperature radiation source in a time-sharing manner, signals emitted by the vacuum variable temperature radiation source c