Ascites is a common clinical manifestation; however, some rare diseases, such as pseudomyxoma peritonei (PMP), may contribute to ascites. The characteristic of ascites caused by PMP is jelly-like texture, and it is difficult to detect early because of non-specific abdominal symptoms. PMP may origin from appendix mucinous adenoma, followed by the ovary. The 47-year-old female with ascites had poor response to first-line treatment of ascites, then PMP diagnosis by ascites cytology. Therefore, the final diagnosis was low-grade appendiceal mucinous neoplasm (LAMN) with metastasis to the ascending colon, peritoneum, uterus and left ovary. The rare case provided valuable insights that ascites with jelly-like texture caused by unknown reason may consider pseudomyxoma of the peritoneum in clinical practice.