The nozzle orifice and flow channel of the air foam generator are precisely calculated to match the flow with different foam ratio mixers, ensuring the mixture of foam liquid and water passes through the nozzle at the optimal flow rate, drawing in sufficient air to form a uniform and dense foam. For foam extinguishing agents with different expansion ratios, the air foam generator can be customized with corresponding flow channel structures to avoid issues like overly large foam that is prone to breaking or too small foam with poor coverage. This allows the air foam generator to maintain an efficient foaming performance in extinguishing various types of fires, quickly forming a dense layer of extinguishing foam.