Preparation in effective component the supernatant liquor that loess is hung is arranged to by using a preparation method for (salted drying) seaweed of the supernatant liquor of loess suspension and gives seaweed. A preparation method by using (salted drying) seaweed of the supernatant liquor of loess suspension includes the following steps:: the Water warfare for being 1day in a loess pottery with charcoal, with 1 ratio a case, mixing loess and purified water in fall purified water: 7-1:11, by a blender stir loess water; It keeps stirring loess water until loess sludge is stable is got off for 12hr or more, obtains the supernatant liquor of loess suspension; Wet seaweed is cut in a trumpet; It is propagated on a bamboo blind and cuts down wet seaweed to manufacture sheet-shaped seaweed; Seaweed is dehydrated on bamboo blind; Bamboo blind is placed under a device, is used to spray the supernatant liquor of loess suspension, loess is sprayed by a nozzle and is suspended on the supernatant liquor on the seaweed of dehydration; Dry seaweed is sprayed with the supernatant liquor that loess is hung.
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