Objective To analyze the CT findings and diagnosis of tuberculous peritonitis (TBP). Methods The clinical data of 64 patients with TBP who underwent abdominal CT scan in the hospital during the period from June 2014 to June 2017 were analyzed retrospectively. CT findings were analyzed, including peritoneal changes, ascites and abdominal lymph node. Results CT findings of patients with TBP mainly included (1) thickening of parietal peritoneum in 43 cases (67.19%) (uniform thickening in 37 cases, irregular thickening in 6 cases), (2) changes of omentum majus in 45 cases (70.31%), showing thickening of the omentum majus, stain - like thickening in 38 cases, (3) mesenteric changesin 48 cases (75.00%), showing mesenteric soft tissue shadow, with small nodule shadow and different degrees of dilated intestinal canal, (4) ascites in 52 cases(81.25%), little ascites in 30 cases, moderate ascites in 18 cases and large amount of ascites in 4 cases, (5)abdominal lymph node changes in 13 cases(20.31%), showing enlargement, increase, of different size and number. Conclusion CT findings of patients with TBP include thickening of parietal peritoneum, thickening of omentum majus, mesenteric soft tissue shadow, ascites and enlargement and increased of abdominal lymph nodes. CT is of great value in clinical diagnosis of the disease.