Magnetic flux leakage zero-sum device and three-phase power transformer

The invention relates to a magnetic flux leakage zero-sum device and a three-phase power transformer, the magnetic flux leakage zero-sum device comprises a second electric field shielding plate, a second zero-sum plate and a first zero-sum plate which are longitudinally connected in sequence, and the first electric field shielding plate and the first zero-sum plate are also connected with third electric field shielding plates which are transversely arranged and are respectively connected with two sides of the second zero-sum plate. When the device is used, the first null-sum plate and the second null-sum plate are three-phase leakage flux null-sum paths, the first electric field shielding plate, the second electric field shielding plate and the third electric field shielding plate play a role in electric field shielding, three-phase leakage flux is counteracted in a null-sum device in a null-sum mode, and therefore the purpose of reducing eddy current loss of a metal structural part is achieved, the null-sum