The patient was an elderly male who had undergone prostate cancer surgery and was seen for a year with a reproducible mass to the right of the right lower abdominal surgical incision, which was initially diagnosed as a right lower abdominal wall incisional hernia. Under local anesthesia with intravenous reinforcement, the patient’s right inguinal area was taken as a conventional inguinal hernia surgical incision on the medial side, and intraoperative exploration revealed a weak abdominal wall defect in the area from the intra-inguinal circumference inward to the right rectus abdominis muscle outer edge, down to the pubic symphysis and outward to the inguinal ligament, with a maximum diameter of about 10X8 cm, and part of the bladder herniated out from the inner part. After sufficient freeing of the preperitoneal space, a 10X10 cm MK disc was fixed in the middle of a 15X15 cm flat sheet and placed into the preperitoneal space from the hernia ring opening, which could cover and exceed the entire abdominal wall defect margin by about 4 cm after fully spreading and fixing, and the MK flat sheet was trimmed and snapped into the spermatic cord and fixed to the posterior wall of the inguinal canal to further strengthen the inner ring opening and the posterior wall of the inguinal canal. The operation went smoothly and the patient was well anesthetized. The diagnosis was determined intraoperatively: right giant rectal hernia. We define a hernia that occurs within the rectal hernia triangle as a straight hernia, but it is rare to find a straight hernia with an abdominal wall defect as large as the entire straight hernia area as in this patient.