Let me introduce a method for extracting plant antifungal preservatives: use male cloves, crush them, add water to soak them, perform steam distillation, extract the fraction - the distillate, and extract it with a solvent , the extracted upper liquid is extracted twice with sodium bicarbonate solution, the twice extracted upper liquid is extracted three times with sodium carbonate solution, and then the solvent in the lower liquid is evaporated, which is the plant antifungal preservative.