The utility model discloses a current limiter for the grounding current of a transformer core, which comprises a cabinet body. A plurality of resistors are arranged in the cabinet body and are connected in series or in parallel with each other through a shorting stub. According to the technical scheme of the utility model, the current limiter served as a special instrument for limiting the grounding current of a transformer core has the advantages of simple structure, convenient carrying and small occupation space. Due to the adoption of the current limiter, the current of an iron core is effectively limited and monitored. Meanwhile, the condition that due to the increased current flowing through the iron core, the iron core emits heat to cause the damage to the insulating layer of the iron core, during the short circuit caused by the contact of the transformer core with the winding under the effect of the electromagnetic force, is avoided.