The invention discloses a steel belt completeness stop alarm device comprising a power supply, an alarm relay and a steel belt guiding frame, wherein the steel belt guiding frame comprises a support, a torsion spring, an insulating plate and a binding post, wherein a groove is arranged on the support, a mandrel is installed in the groove, the torsion spring is wound on the mandrel, the insulating plate is fixed on the support, the binding post is fixed on the insulting plate, a conductive coil is arranged in the alarm relay, one end of the conductive coil is electrically connected with a switching power supply while the other end is electrically connected with the binding post, the power supply is also electrically connected with the support, and the power supply, the alarm relay and the steel belt guiding frame form an electric loop. The steel belt completeness stop alarm device has the advantages that the whole set of actions is automatically completed, with no need of manual intervention, the labor intensity of staffs is reduced, the production efficiency of equipment is improved, operation personnel does not need to constantly pay attention to a belt completeness condition of a machine, an operator can operate multiple pieces of equipment, and the labor cost of an enterprise is reduced.