The invention discloses an arc light protection method. A current signal and a light wave signal are subjected to AND logic judgment; a timer is adopted, and a voltage signal is taken for reference; the signals are output to a circuit breaker through a rapid relay; and the voltage signal is taken for reference, so that the action reliability of an arc light protection apparatus is improved, and wrong actions are avoided. The protection problem existing in equipment internal faults and low current changes is solved; the arc discharge, mechanical vibration and abnormal displacement faults of power equipment are judged based on electric parameter characteristics, so that the power failure time for users is furthest reduced, and the service life of the existing switch related equipment is prolonged.