The utility model provides a tangential belt tensioning tool, and belongs to the technical field of tangential belt installation. The tangential belt tensioning tool comprises a supporting
assembly and a clamping
assembly, the supporting
assembly comprises a
machine base, a supporting frame and a driving piece, the supporting frame is installed on the top of the
machine base, the driving piece is installed on one side of the supporting frame, and the clamping assembly comprises a connecting block, a middle block, a pressing block, a locking piece and a tangential belt. The connecting block is fixedly connected to one side of the driving part, by arranging the
machine base, the supporting frame, the driving part, the connecting block, the middle block, the pressing block, the locking part and the tangential belt, the tangential belt is arranged on a transmission wheel in a sleeving mode, then the connecting block, the middle block and the pressing block are used for clamping the tangential belt, and then the driving part is used for driving the connecting block, the middle block, the pressing block and the tangential belt to move. The tangential belt is tensioned towards the other transmission wheel, so that the tangential belt can be conveniently sleeved on the two transmission wheels, and damage to the tangential belt and the transmission wheels is avoided.