Eight-span stitched catenaries and a three-dimensional moving tornado field based on the Wen model have been established to investigate the dynamic response of the high-speed railway catenary under tornado loads. The research focuses on the influence of key parameters such as tornado level and moving speed on the dynamic response of the catenary. The results show that the maximum transverse displacement response of the contact wire occurs before the center of the tornado field reaches the catenary.The moving speed of tornado within a certain range leads to the severe vibration response. While the moving speed continues to increase，the contact wire transverse displacement responses decrease. Under the action of the F1 and F2 tornadoes selected of this research，the maximum transverse displacement response of the contact wire is within the allowable range of the specification.However，under the action of the F3 tornado，the vibration response of the contact wire is close to or even exceed the limitation，the issue of which should be concerned.