Auricularia auricula itself is not toxic, but it is not recommended to eat cold salad overnight. Even if it is put in the refrigerator, it may be invaded by bacteria, and cold salad usually does not heat, so it is easy for human bodies to cause gastrointestinal discomfort such as abdominal pain and diarrhea after eating, so it is generally not recommended to eat cold salad auricularia auricula overnight. So as not to cause food poisoning. It's better to eat it now, which is safer and more reassuring, especially in summer, although it is put in the refrigerator, it can't avoid the possibility of bacterial growth.