Objective To analyze the clinical value of MRI quantitative diagnosis of ovarian tumors. Methods The medical records of 91 patients with ovarian tumors who admitted to the hospital from June 2015 to June 2018 were selected. All patients were examined by MRI and treated with surgery. According to the pathological results, they were divided into malignant group (n=35, pathologically confirmed as malignant ovarian tumor) and benign group (n=56, pathologically confirmed as benign ovarian tumor). The imaging features, MRI quantitative parameters [capacity transfer constant (Ktrans), rate constant (Kep), extravascular extracellular space-volume fraction (Ve)] and apparent diffusion coefficient (ADC) values of both groups were analyzed. The above indicators were compared between patients with different stages, and the efficiencies of quantitative parameters and ADC in the differential diagnosis of benign and malignant ovarian tumors were analyzed. Results The Ktrans, Kep and Ve in benign group were lower than the control group, and the ADC value was higher than the control group (P<0.05). The tumors in benign group were type I (inflow type) while those in malignant group mainly were type III (outflow type). With the increase of FIGO stage, the Ktrans, Kep and Ve of patients with malignant ovarian tumors increased, and the ADC value decreased (P<0.05). Among the quantitative parameters, the AUC, specificity and the maximum Youden index of Ktrans were the largest in diagnosis of malignant ovarian tumors, followed by ADC, Kep and Ve. The sensitivity of ADC was the highest in diagnosing malignant ovarian tumors. Conclusion MRI quantitative parameters are an important supplement for routine MRI in the diagnosis of ovarian tumors and clinical staging. They help the identification of benign and malignant ovarian tumors.