Objective To investigate the diagnostic value of magnetic resonance diffusion weighted imaging (DWI) in ovarian fibroma. Methods 43 patients with ovarian fibroma confirmed by operation or pathology in our hospital from October 2015 to November -2016 were selected as the research objects, all patients underwent magnetic resonance imaging before treatment, including T1WI, T2WI and DWI scan. The results of MRI scan combined with DWI scan were compared with the results of operation or pathological examination. Results In 43 patients, MR scan showed that the average tumor size was (5.98±3.11)cm, the 33 tumors were regular round or round shaped, 5 tumors were divided into leaves, and 5 tumors were irregular. In 6 cases, the edges were not smooth and 37 cases were round. Compared with pathological findings, 43 cases of ovarian fibroma, the diagnostic accuracy of magnetic resonance diffusion weighted imaging for superficial primary tumors was 95.35%, sensitivity was 86.75%, positive predictive value was 97.13%. The accuracy of MR diffusion weighted imaging in diagnosis of deep root tumors was 93.02%, sensitivity was 95.86%, and positive predictive value was 86.63%. Conclusion MR diffusion weighted imaging can clearly show the imaging features of ovarian fibroma, with high diagnostic accuracy, and can improve the reliable imaging data for the clinical.