The invention relates to a fault simulating training device of a current transformer. The device comprises a low-voltage current transformer body equipped with a tap, a wireless transmitter that is used in match, a wireless switch control driver and a housing; a fault simulating switch executing circuit, which is electrically connected with a wireless switch control driver, is arranged between a secondary side of the current transformer body and an output wiring terminal of the housing; a remote control transmitter is used for transmitting a fault control signal input by an operator to the wireless switch control driver by a wireless mode; the wireless switch control driver is used for receiving the fault control signal of the remote control transmitter; the control fault simulation switch executing circuit realizes transformation ratio switching simulation of the current transformer body, polarity adding and reducing switching simulation, exceeding impedance and normal impedance switching simulation, connection and disconnection switching simulation of the secondary side. With the adoption of the fault simulating training device of the current transformer, various site faults can be reproduced, the training efficiency is high, and the consistency with the site is high.