A tensioner sleeve is a mechanical device that connects shafts and sleeves to provide good power transmission and connection when rotating. Its main function is: by adjusting the position and assembly method of the sleeve, changing the gap in the axial direction, so that the assembly is tightened, the power transmission efficiency is improved, the vibration and noise are reduced, and the friction between the shaft and the sleeve is enhanced to achieve a reliable connection effect. The tensioning sleeve is composed of an inner sleeve, an outer jacket and a tensioning bolt, etc., the inner sleeve is installed on the shaft, there is a certain gap between the jacket and the inside, the distance between the sleeve and the shaft can be adjusted by the bolt, and then the tensioning bolt makes the sleeve and the shaft closely connected, reducing the axial clearance.