A surgical instrument can be introduced to the abdominal cavity through a current trocar puncture to place a suture in the deep facia and peritoneum of the anterior abdominal wall. The instrument is lightweight and easy to use, and can be operated quickly and efficiently to close the trocar puncture wound in a simple and economical manner. The instrument is used to suture the deep facia and peritoneum of the anterior abdominal wall on opposite sides of the trocar puncture wound inside the abdomen to close the trocar puncture wound.