Objective To explore the clinical value of magnetic resonance imaging in the diagnosis of recessive fracture of knee joint. Methods? A total of 62 patients with recessive fracture of the knee treated in the Second People's Hospital of Pingliang City from September 2015 to July 2020 were selected as the research objects. According to different examination methods，they were divided into MRI group and CT group. All patients underwent MRI and MSCT examinations，and were divided into MRI group and CT group according to the different examination methods，and arthroscopy was used as the “gold standard” for comparative analysis. The diagnostic rate，type detection rate and examination value of the patients were compared. Results? There was no statistically significant difference in the disease examination rate between the all patients（P＞0.05）. The accuracy，sensitivity and specificity of the MRI test group were 95.16%，96.36% and 85.71%，which were significantly higher than those of the CT group（82.25%，83.93%，66.67%）（P＜0.05）. The detection rate of grade 1，2 and 3 fracture injury in MRI Group was higher than that in CT group（P＜0.05）. Conclusion? MRI examination for the diagnosis of patients with occult fracture of the knee joint can more clearly show the displacement and number of fractures，further improve the diagnosis rate of the disease，provide accurate reference for the followup treatment of doctors，and make the corresponding treatment plan，which has a high clinical application value.