Abstract: 【Objective】Feed utilization is a main direction of the comprehensive utilization for major crop straw in China,and this study aimed to enhance the recovery efficiency and quality of straw and address the limitations of conventional forage square baling machines,which included a restricted application range,low operational efficiency,subpar crushing quality,and ineffective dust removal.【Method】Drawing upon the fundamental principles of straw shredding,kneading,and compression baling,a 9YQ-2200S square baling machine was developed through theoretical analysis,calculations,and SolidWorks three-dimensional design techniques.This machine was tailored for use in fields cultivating crops such as corn,wheat,rice,and cotton.Following the design phase,a prototype was manufactured,tested,and refined.Field trials were conducted specifically using corn straw.【Result】The field test outcomes demonstrated that the prototype achieved a 90.3%net collection rate,100%baling rate,100%regular baling rate,91.66%fall resistance rate,bale density of 119.67 kg/m~3,and productivity of 3.36 t/h.All operational parameters met relevant standards,affirming the superior performance of the square bale baler.【Conclusion】This machine excels at automatically gathering crop straws,chopping,silk kneading,dust removal,high-density compression,and automatic rope binding.The findings of this study offer valuable insights for the design and enhancement of straw square baling machines.