As a medium-sized professional foam fire truck, its core is capable of foam and clean water dual mode fire fighting, accurately adapting to Class A and B fire handling, and giving consideration to professionalism and versatility. Equipped with an efficient foam proportion mixing system, foam liquid can be mixed with water at an accurate proportion of 0.3% -6% to generate an efficient extinguishing foam. The foam can cover the surface of combustibles, play the multiple roles of oxygen and asphyxiation isolation, radiant heat isolation, and heat absorption cooling, quickly suppress flammable liquid fires (Class B fires) such as gasoline, diesel, chemical solvents, and adapt to high-risk scenarios such as gas stations, chemical parks, oil depots, with fast extinguishing speed and outstanding anti rekindling effect. At the same time, it can flexibly switch the water extinguishing mode, relying on the fire pump to pressurize and spray, efficiently extinguish solid material fires (Class A fires), achieve multi-purpose use of one vehicle, meet the needs of fire disposal in multiple scenarios, and greatly improve the adaptability of rescue.