The invention relates to the field of transformer fault simulation, in particular to a transformer with a common fault simulating function. The transformer comprises a transformer body, wherein a silicon-steel sheet iron core is arranged in the transformer body; and a winding is wound on the silicon-steel sheet iron core. The transformer is characterized in that three iron core grounding sleeves are arranged on the top of the transformer body; three grounding lines are led to the iron core grounding sleeves from the silicon-steel sheet iron core, wherein the first grounding line and the second grounding line are led out from two adjacent silicon-steel sheets at the positions of about 25 percent of chip level; the third grounding line is led out from the silicon-steel sheet at the position of about 75 percent of the chip level; and a grounding line is led out of each of the three iron core grounding sleeves for realizing the grounding or the disconnecting externally. The transformer with the common fault simulating function has the advantages that the research on monitoring and detecting devices for the faults such as the grounding of two points of iron cores, the short circuit between iron core plates, overheating, partial discharging and the like, the research on the development process of the faults under various working conditions, and the research on fault coping strategies and the like can be carried out on the basis of a test transformer provided by the invention.