String beans are a common food. The symptoms of poisoning are mainly due to the consumption of beans that have been stored for a long time, or the lack of fire and time when cooking them. It occurs mainly in collective schools and canteens. It contains saponin and alkaloids, which cause symptoms of poisoning and mucous membrane irritation in the gastrointestinal tract. However, the symptoms vary depending on the patient’s condition, for example, if the patient is old and weak and has more basic diseases, severe nausea, vomiting and electrolyte disorders in the gastrointestinal tract occur after consuming string beans, leading to critical condition and unpredictable situation.