The invention discloses a power line carrier wave communication test program control attenuator and a control method thereof; the power line carrier wave communication test program control attenuator comprises a first carrier wave isolation filtering module connected with an attenuator control device through a line; the attenuator control device is connected with a second carrier wave isolation module through a line; a carrier wave attenuator in the prior art can only realize single carrier frequency signaling attenuation, a carrier wave signal attenuation value is fixed, and program control cannot be realized; when testing a receiver performance, the attenuator modules with fixed attenuation values need to be continuously replaced, so a testing process is complex, and work efficiency is low.