The invention discloses a layered and domain-partitioned island protection method with a non-fault-trip preventing function aiming at a large-scale wind power plant. The layered and domain-partitioned island protection method comprises the steps of: starting a non-fault-trip prevention real-time detection module, detecting all circuit breakers in a wind power generation system in real time; monitoring tripping signals of all the circuit breakers arranged in the wind power generation system; judging whether cluster main station sending-out tie lines and main transformers are all cut off through tripping signals of circuit breakers of a cluster main station, and protecting a formed island; judging whether an island is formed due to booster station transformer faults through tripping signals of booster station transformer circuit breakers, and protecting the formed island; judging whether an island is formed due to wind power plant collection bus faults through tripping signals of wind power plant collection bus circuit breakers, and protecting the formed island; and judging whether an island is formed due to wind power plant current collection feeder faults through tripping signals of fan feeder circuit breakers, and protecting the island formed due to the wind power plant current collection feeder faults. The layered and domain-partitioned island protection method achieves the advantages of being fast, accurate, efficient, safe and stable.