The utility model relates to a fish tail guide groove device is prevented to wire rod belongs to high -speed rod rolling auxiliary assembly technical field. Including the guide slot, it improves the part and is: is still including installing in the groove guide pulley in guide slot exit, the race tank bottom of groove guide pulley higher than guide slot bottom plate 2 for it 3mm. The utility model discloses can effectively solve the surperficial fish tail defect that the wire rod leads to with guide slot bottom plate sliding friction in the guide slot transmission course, improve wire rod product surface quality, improve the product rate of certified products, simultaneously guide slot life can be promoted by a wide margin, the spare parts cost is reduced, the utility model discloses simple structure, dismouting, maintenance convenience, long service life promotes broad prospect.