The invention discloses a power gridaccess defense method of a magnetic circuit control type fault current limiter, which comprises three layers of defense including local defense, emergency defense and power grid defense; local defense: by configuring a fault current limit protection device, that protection device can ensure that after a magnetic circuit-controlled fault current limiter fail, theprotection device can isolate a fault through a bypass circuit breaker closing or a line circuit breaker tripping to remove the fault; Emergency prevention means that the line protection device and the safety and stability control device switch the operation setting value and the operation criterion according to the fault current limiter state to ensure that the control measures of the power network are not mismatched; At that same time, the fault current limit protection device sends the fault current limit state information to the D5000 system, and the grid dispatcher adjusts the grid operation mode accord to the anticipated strategy to form the grid defense, so as to ensure the safe and reliable operation of the grid after the line is cut off. The invention improves the adaptability ofthe power network control measures after the fault current limiter equipment is faulty, and further supports the actual large power network application of the magnetic circuit control type fault current limiter.