The utility model relates to a simulation fault transformer which is applied to electrical test professional skill training teaching. According to the utility model, transformer transformation is carried out for an interphase imbalance fault of a direct current resistor and an unqualified fault of an insulation resistor of a transformer; each phase of the low voltage side of the transformer is respectively connected in parallel with a resistor R1, a resistor R2 and a resistor R3; each phase of the first end of the high voltage side of the transformer is connected in series with a group of resistor RA, resistor RB and resistor RC; a resistor R change is connected between an A phase of the high voltage side of the transformer and an a phase of the low voltage side of the transformer; a C phase of the high voltage side of the transformer and the a phase of the low voltage side of the transformer are respectively connected with a group of resistor RC1 and resistor Ra. The abilities of fault analyzing, judging and processing of a student are trained. The direct current resistor and the insulation resistor are changed in the manner of resistor series and parallel connection of a winding, so as to realize the function fault self-setting.