The utility model relates to a power filter structure, specific passive power filter of well high -power and EMI noise measurement device that says so, its characterized in that is equipped with inductance lc1, inductance lc2, differential mode capacitor cx, common mode electric capacity cy, wherein establish ties respectively on the looks line by A looks, B looks, C looks in the triple line of electric power system introduction two inductance lc1, lc2, and the front end that corresponds inductance lc1 in the triple line has met differential mode capacitor cx respectively, and three differential mode capacitor cx's the other end is connected with common mode electric capacity cy, common mode electric capacity cy ground connection, the front end that corresponds inductance lc2 in the triple line has met differential mode capacitor cx respectively, and three differential mode capacitor cx's the other end is connected, compared with the prior art, the utility model, the advantage that have easy operation, instrument frequency stability is high, data are observed, the processing is very convenient etc. Is showing.