The invention is a producing method of anti-gas yeilding additive of transformer oil. At first, it uses petroleum distillation, boiling point 250-500 deg.C, as raw material, adopts any one or more of the hydrogenation catalyzer; Co-Mo, Ni-Mo, W-Ni and Mo-Co-Ni to make hydrogenation process; secondly, and at constant pressure distils the produced oil after the hydrogenation process to get the distillation, boiling point 280-360 deg.C, so as to get the additive; the usage: adding the additive to common transformer oil, concocting to get super-high transformer oil.