It is not normal to vomit green liquid after gastric surgery. The green liquid vomited may be bile, as the patient’s gastrointestinal function has not yet recovered at this time. When the patient undergoes gastric surgery, the environment of the stomach is changed, and the peristaltic rhythm of the stomach is deranged, which may become faster or slower, leading to disturbances in gastric dynamics as well as difficulties in gastric emptying, weakening the contractile ability of the remnant stomach and reducing the function of the remnant stomach in grinding food. The normal function of the residual stomach and distal jejunum is affected after the surgery, and the food transfer function is impaired. When the secreted bile enters the duodenum and cannot be passed downward, green bile will be vomited when vomiting. Therefore, after the gastric surgery, you can consume liquid food in small amounts and many times, which can gradually restore the gastrointestinal function, and you will not have the symptom of vomiting green liquid.