The invention discloses an airport demisting system and a demisting method. The system comprises a plurality of outdoor demisting electric heating blanket bodies, a steel chisel, a strapping tape andan electric heating power source system. The airport demisting system has the advantages that the local visibility near the outdoor large-area terrain can be improved under the mist condition, and larger benefits are achieved when the system is applied to busy or large airports. During use, only transporting, loading and unloading are needed, demounting and mounting are convenient, the system canbe stored to be used many times, special maintenance is not needed, and operation is easy and convenient. The power is adjustable, demisting is carried out by changing the local air temperature condition of the low altitude, and then the visibility of the local area of the low altitude is improved. Environmental pollution is avoided, and the system can be used for a short time according to the mist condition and needs. Safe flight can be guaranteed by improving the visibility, social benefits, economic benefits and the technology and management level can be improved, service quality can be improved, and the comprehensive traffic order and the social reputation of civil aviation are improved. Then the hourly rate of the airports, runways and airplanes are increased, the effects of increasing revenue and reducing expenditure are achieved, the flight delay rate caused by the mist can be reduced, and the annual flight on-time performance statistical level is greatly improved.