A tensioning mechanism, comprising: a first housing, wherein the first housing comprises an accommodation cavity, and the first housing is configured to be sleeved with a to-be-tensioned material; a tensioning assembly, wherein the tensioning assembly is mounted in the accommodation cavity; and a driving assembly, wherein the driving assembly is mounted on the first housing, and the driving assembly is configured to drive the tensioning assembly to move against the first housing, so that at least a part of the tensioning assembly protrudes from or retracts into the first housing, wherein the driving assembly comprises a handle, the handle is mounted on an outer side of the first housing, and the handle is configured to manually drive the tensioning assembly to move against the first housing; wherein the tensioning assembly comprises a pressing piece and a connecting piece, a first end of the connecting piece is connected to the pressing piece, a second end of the connecting piece is connected to the driving assembly, and the driving assembly drives, through the connecting piece, the pressing piece to move against the first housing; and when the material is put on the tensioning mechanism, the pressing piece protrudes from the first housing by a length greater than a distance between the material and the first housing; wherein the driving assembly comprises an plunger rod, one end of the plunger rod is connected to the handle, the other end of the plunger rod is connected to the second end of the connecting piece, and the handle drives, through the plunger rod, the connecting piece to rotate; wherein the handle is able to rotate against the first housing; characterized in that the driving assembly further comprises a cam, the cam is fixedly connected to the handle, and one end of the plunger rod is connected to the handle through the cam; and the handle is able to drive the cam to rotate around a second rotation shaft, so as to drive the plunger rod to ascend and descend against the first housing. a first housing, wherein the first housing comprises an accommodation cavity, and the first housing is configured to be sleeved with a to-be-tensioned material; a tensioning assembly, wherein the tensioning assembly is mounted in the accommodation cavity; and a driving assembly, wherein the driving assembly is mounted on the first housing, and the driving assembly is configured to drive the tensioning assembly to move against the first housing, so that at least a part of the tensioning assembly protrudes from or retracts into the first housing, wherein the driving assembly comprises a handle, the handle is mounted on an outer side of the first housing, and the handle is configured to manually drive the tensioning assembly to move against the first housing; wherein the tensioning assembly comprises a pressing piece and a connecting piece, a first end of the connecting piece is connected to the pressing piece, a second end of the connecting piece is connected to the driving assembly, and the driving assembly drives, through the connecting piece, the pressing piece to move against the first housing; and when the material is put on the tensioning mechanism, the pressing piece protrudes from the first housing by a length greater than a distance between the material and the first housing; wherein the driving assembly comprises an plunger rod, one end of the plunger rod is connected to the handle, the other end of the plunger rod is connected to the second end of the connecting piece, and the handle drives, through the plunger rod, the connecting piece to rotate; wherein the handle is able to rotate against the first housing; characterized in that the driving assembly further comprises a cam, the cam is fixedly connected to the handle, and one end of the plunger rod is connected to the handle through the cam; and the handle is able to drive the cam to rotate around a second rotation shaft, so as to drive the plunger rod to ascend and descend against the first housing.