The utility model provides a cylinder fixing device and effectively solves the difficult problem that a high-speed rotating cylinder-shaped object cannot be reused after emergency brake. A lead screw is arranged on one side of a fixed tray. The lead screw is connected with an active slip sheet. Fixed rings are uniformly arranged on the periphery of the fixed tray. A slip sheet groove with the same center with the active slip sheet is formed in the middle of the fixed tray. A passive slip sheet is arranged inside the slip sheet groove, and capable of sliding inside the slip sheet groove. When brake equipment used for an ultra high-speed rotating cylinder emergency brake is manufactured, a spring with the same center with the active slip sheet is arranged in the slip sheet groove between the active slip sheet and the passive slip sheet, and therefore the functions of braking and buffering are performed. The cylinder fixing device has the advantages of being scientific in design, simple to manufacture convenient to operate and capable of effectively avoiding damage on the high-speed rotating cylinder-shaped object due to the emergency brake.