Abstract: The disclosure relates to a self-locking tourniquet, including a base strap, a binding strap, a buckle frame and a tightening component, where the binding strap is attached to one end of the base strap, the buckle frame is connected to the other end of the base strap, the buckle frame is provided with a buckle hole in a through-type, the binding strap is fixedly connected with a self-adhesive, the self-adhesive extends longitudinally along the binding strap; the tightening component includes a tightening belt, a tightening handle and a stop ring, where one end of the tightening belt is fixedly connected with the binding strap, and the other end of the tightening belt is fixedly connected with the base strap; the tightening handle is provided with a tightening hole in a through-type; and the tightening belt passes through the tightening hole, and the stop ring is connected to the base strap.