Abstract: Cluster crack on the surface of wire rod is one of the defects of large size wire rod. The macroscopic morphology and metallographic analysis of the cluster cracks in the rolling process and finished samples were carried out.Finite element analysis of rough rolling was carried out. The stress and strain of the rough rolling parts were simulated.Combined with the actual rolling production, the rough rolling groove shape was optimized. Finally, the cluster crack on the wire surface is effectively alleviated.