As a heavy professional foam fire truck, it has the dual mode fire fighting capability of foam and clean water, focuses on efficient fire disposal in large and high-risk scenarios, and accurately adapts to Class A and B fires. It is an indispensable rescue equipment for chemical plants, airports, large commercial centers and other places. Equipped with an efficient balanced proportion mixing device, the mixing proportion can be accurately adjusted by 3% and 6%, and the mixing accuracy is up to 99%. It is compatible with a variety of special foam solutions such as protein foam, aqueous film forming foam, etc. After being covered with foam, it can quickly isolate oxygen asphyxia, block radiant heat, and efficiently put out fires of flammable liquids such as gasoline, diesel, chemical solvents (Class B). It is fast in putting out fires, and has outstanding anti rekindling effect, especially suitable for high-risk areas such as petrochemical industry, terminal oil depot, airport, etc. At the same time, it can flexibly switch between clear water fire extinguishing modes, relying on high-power fire pumps to pressurize and spray, efficiently extinguish solid material fires (Class A), achieve multi-purpose use of one vehicle, meet the needs of fire disposal in multiple scenarios such as urban main roads, large factory areas, and high-rise buildings, and balance professionalism and universality.