Objective To analyze the findings and diagnostic value of ultrasound and magnetic resonance imaging (MRI) for breast fibroadenoma. Methods One hundred patients with pathologically confirmed breast fibroadenoma between February 2013 and February 2016 were selected as the study subjects. Before operation, all subjects underwent ultrasound and MRI examination. The respective imaging findings were observed. With postoperative pathological results as the golden standard, the coincidence rate was compared between ultrasound and MRI in the diagnosis of breast fibroadenoma. Results The imaging findings showed that there were a total of 118 pathologically confirmed breast fibroadenomas. Ultrasound showed that 93 were round or quasi-circular, 86 with capsule like echo, 76 with internally homogeneous echo, 28 with calcification, 60 with grade 0 blood flow signal and 501 with grade 1, MRI show that 96 were round or quasicircular, 90 with clear edges, 108 with equal signal on T1WI, 94 with high signal on T2WI, 78 with homogeneous enhancement and 19 with inhomogeneous enhancement. TIC typing showed 93 of type I, accounting for 78.81%. The coincidence rate of ultrasound in the diagnosis of breast fibroadenoma (90.00%) was significantly lower than that of MRI (98.00%) (P<0.05). Conclusion The typical imaging findings of ultrasound and MRI can help the diagnosis of breast fibroadenoma. Compared with ultrasound, MRI has more advantages in the diagnosis of breast fibroadenoma.