The invention discloses a power filter circuit and a power filter for a broadband power line carrier communication test system. The power filter circuit comprises an AC input end, a primary LC filter network, a discharge resistor, a common-mode signal inhibition circuit, a secondary LC filter network, a carrier wave signal coupler, a signal output end and an AC output end, wherein the discharge resistor and the common-mode signal inhibition circuit are arranged between L and N lines which are arranged between the primary LC filter network and the secondary LC filter network, the carrier wave signal coupler is arranged between L and N liens at the front end of the primary LC filter network, and the signal output end is connected to output of the carrier wave signal coupler. According to the power filter circuit and the power filter, noises of the power lines can be isolated, a reliable test environment is provided for broadband power line carrier products, the arranged carrier wave signal coupler can convert carrier waves signals from differential-mode signals into common-mode signals, and thus, the carrier wave signals can be transmitted via shielding RF lines.