A tensioning mechanism includes a housing including an accommodation cavity and configured to be sleeved with a to-be-tensioned material, a tensioning assembly mounted in the accommodation cavity, and a driving assembly mounted on the housing and configured to drive the tensioning assembly to move against the housing, so that at least a part of the tensioning assembly protrudes from or retracts into the housing. The driving assembly includes a handle mounted on an outer side of the housing and configured to manually drive the tensioning assembly to move against the housing.