The invention relates to a gas furnace burning nozzle cleaning method, and discloses a gas furnace burning nozzle cleaning method which is low in cost and good in cleaning effect. The cleaning method is characterized by comprising the steps that firstly, a gas furnace burning nozzle is soaked with a prepared cleaning agent, and blocking impurities are soaked to be softened; secondly, all channels of the gas furnace burning nozzle are flushed with high-pressure water; and finally, cleaning detection is conducted. According to the gas furnace burning nozzle cleaning method, the cleaning effect is good, a nozzle body can not be destroyed, convenience and practicability are achieved, and the maintenance cost of the gas furnace burning nozzle of a power plant can be significantly reduced.