Objective To analyze the image features of MRI scan in female pelvic cavity occupying diseases and to explore its diagnostic value. Methods A total of 74 female patients with pelvic cavity occupying diseases were selected from our hospital from January 2016 to December 2016, collect the patients' general information, imaging data, and to observe the imaging features of pelvic mass in different sequences of MRI, the diagnostic accuracy of MRI scan in female pelvic cavity occupying diseases was analyzed by comparing with biopsy. Results Among the 74 patients, 54 cases (72.97%) cystic lesions were present, 15 were ovarian cystadenoma, 18 cases of ovarian endometriosis cyst, 10 cases of pelvic abscess, 11 cases of ovarian cyst, 20 cases (27.02%) had cystic solid lesions, including 11 cases of ovarian teratoma and 9 cases of ovarian cancer, the diagnostic accuracy of MRI scan was 94.59% (70/74). Pelvic cystic space occupying lesions have larger lesions with clear boundaries, the signal is uniform and the strengthening is not obvious. In cystic solid occupying lesions, the diameter of ovarian teratoma tumors is >5cm, the boundary is clear, T1WI is high signal, and T2WI is slightly higher, bones, teeth and other low signals can be seen in the tumor, the fat suppression sequence showed no signal enhancement, and the enhancement was not obvious; borderline lesions in ovarian cancer, the cystic area T1WI showed low signal intensity, and the enhanced lesions showed moderate enhancement. Wall nodules and septa were observed in the lesions. Conclusion MRI scan can clearly display the imaging features of different benign and malignant diseases of pelvic cavity occupying diseases, and the diagnostic accuracy is high, and reliable imaging data can be improved for clinical use.