Abstract: Initial cleaning is the primary step in residual film recycling, with crushing being essential for effective initial cleaning. Developing crushing technology and equipment to efficiently break down film impurities is crucial for ensuring subsequent cleaning efficiency and recycled product quality. Existing residual film crushing devices effectively process loose film and similar materials, but residual film recovery has shifted from loose materials to bale recovery. After the recovery, the film stray round bale is more compact than the bulk material wrapping, and the mechanical properties are quite different, so the crushing effect of the whole bundle of film stray round bale is very limited. In order to solve the problems of large volume, compact winding and mechanical properties, which are difficult to effectively break the whole bundle and affect the resource utilization of the residual film, this study designed a single-roll square blade crushing device based on the principle of sliding cutting. Based on the description of the overall structure and working principle, combined with the characteristics of the film receiving mixed round bale material, through the theoretical analysis of the crushing process of the device, it is obtained that the main factors affecting the crushing quality are the pushing speed of the pusher plate, the rotating speed of the blade roller and the vertical height of the blade roller and the lower fixed blade. The structure and working parameters of the crushing device, including the curve and shape of the moving and fixed blade edge, the outer diameter of the moving blade roll, three kinds of arrangement of the moving and fixed blade, and the clearance between the moving and fixed blade, were determined. The maximum outer dimension of the broken residual film after unfolding was divided into four distribution ranges for sorting and weighing. In the process of material classification and statistics, the materials with smaller dimensions and those that could not be collected were all classified into the minimum size range for statistics. The residual film with the maximum outer dimension within the range of 0,100) mm and 500,～) mm was defined as over-broken film and over-long film, respectively. These two kinds of residual film are unqualified, and those within the range of 100,300) mm and 300,500) mm are defined as qualified residual film, and the percentage of qualified residual film mass in the sample is the qualified rate of residual film breakage. A three-factor and three-level response surface test was carried out with the qualified rate of broken residual film as the test evaluation index. The influence of each test factor on the performance of the device was analyzed, and a regression model was established for the clearance between the moving blade and the lower fixed blade, the arrangement of the blade, the rotational speed of the blade roll and the qualified rate of broken residual film. The optimal parameter combination of the device was obtained by using the parameter optimization function of Design-Expert software. The test results show that the main and secondary factors affecting the pass rate of residual film crushing are respectively the rotating speed of the blade roll, the clearance between the moving blade and the lower fixed blade, and the arrangement of the moving blade. The clearance between the moving blade and the lower fixed blade is 14 mm, the moving blade arrangement is staggered, the blade roll speed is 165 r/min, the qualified rate of broken residual film reached the maximum value of 69.51%.The average qualified rate of broken residual film obtained by verification test is 70.78%, and the error of the model prediction is kept within 2%. The device can realize the whole bundle broken of film and miscellaneous bundle materials, and the crushing quality can meet the requirements of film miscella resource utilization. The research results have a certain reference significance for the research and development of the breaking device for the film and miscellaneous bundle materials in cotton field.