Objective To analyze the clinical value of MRI in the diagnosis and differential diagnosis of ovarian tumors. Methods 68 cases of ovarian cancer treated in our hospital from January 2016 to January-2017 were selected, collect general information and imaging data of patients, observe the imaging features of ovarian tumor in MRI scan, analyze the accurate diagnosis rate and differential diagnostic accuracy of MRI scan in ovarian tumors by biopsy. Results There were 82 lesions in 68 cases confirmed by operation, unilateral lesions in 54 cases, bilateral lesions in 14 cases, 80 lesions were detected by MRI scan, and the detection rate of lesions was 97.56% (80/82). The accurate diagnosis rate of ovarian tumor by MRI scan was 92.64% (63/68). The diagnostic accuracy ranged from high to low for ovarian granulosa cell tumor, ovarian cancer, ovarian cystadenoma, simple ovarian cyst, ovarian chocolate cyst, and ovarian mature teratoma, the accuracy rates were 100%, 100%, 92.85%, 92%, 91.66%, 88.88%, respectively. MRI images showed benign tumors with larger lesions, mainly cystic, cystic wall thin, clear boundaries, regular morphology, T1WI showed low signal, T2WI showed high signal, and enhanced scan without obvious enhancement; The fuzzy boundary of malignant lesions, T1WI showed low signal, T2WI showed slightly higher signal, necrosis area was longer and longer T1 T2 signals were enhanced are highly heterogeneous enhancement, boundary of lesion and surrounding tissues is not clear. Conclusion MRI is more accurate in the detection and diagnosis of ovarian tumors, the image features of ovarian tumors can be clearly displayed, the utility model is beneficial for improving the accuracy of the qualitative diagnosis of ovarian tumors, and is worthy of clinical application.