The utility model discloses a be applied to experimental filter of electromagnetic compatibility, including integrated three -phase voltage filtering module and three phase current filter module together, three -phase voltage filtering module and three phase current filter module constitute by multistage band -pass filter module. By adopting the above structure, the utility model, install the device additional between electro magnetic compatibility test equipment and testing power supply, the filtering interference signal reduces the influence to mains side equipment effectively for the testing power supply also can be regarded as to ordinary programme -controlled standard source, and need not use dear electromagnetic compatibility special test power.