Abstract: A strapping device includes a main frame and a lever pivotally mounted to each other by an axle. The main frame has a first stop plate slidably mounted to selectively engage to ratchet that is mounted on the axle and the lever has a second stop plate mounted to drive the ratchet. A groove is defined in the main frame and has one side formed with a limiting side. The strain of the strap can reverse the axle to release the strap when the second stop plate is received in the groove. A stopper radially extends from the main frame and has a protrusion extending therefrom. The protrusion of the stopper prevents the lever from being backward moved to the original position due to the strain of the tightened strap.