The quick-plug soap nozzle is a commonly used nozzle for cleaning machinery. Its main function is to spray the detergent mixture evenly on the surface of the object to be cleaned, enhance the detergency, and easily remove stubborn dirt, oil stains, etc. on the surface to be cleaned; the quick-plug connection makes the nozzle more convenient to use, and other nozzles can be immediately replaced after use for the next cleaning work; after the high-pressure cleaning machine pump is replaced with a soap nozzle, due to the siphon principle, it will automatically open the siphon valve installed at the outlet of the pump, suck in the detergent, and mix it with the high-pressure water flow from the pump to form a clean mixture. At the same time, the water flow pressure on the high-pressure pipeline will be reduced, which is convenient for spraying the clean mixture. This is widely used in the field of high-pressure cleaning operations. Only one high-pressure cleaning machine is needed, and no other equipment is needed to complete the operations of spraying detergents and high-pressure cleaning.