In the strip trimming process, defects such as buckle edge, burr, and imbalance of cutoff ratio often occur. This study investigated the mechanism of these defects and analyzed the influence of disc shears process parameters, including overlap, clearance, fron and back tension on the quality of strip edge. On this basis, a comprehensive evaluation function of strip trimming quality is proposed. Furthermore, the process parameter optimization technology of the disc shears is developed. Subsequently, an on-line grinding device for strip edge is designed to fundamentally control burr defect. Via field application of this technology and this device, the comprehensive treatment of buckle edge, burr, and imbalance of cutoff ratio is realized. Therefore, improving the quality of finished strip is helpful and has the value of further popularization and application.