Abstract: In view of high traction resistance, substandard land flatness, and low work efficiency found in current soil preparation machinery used in Xinjiang Uygur Autonomous Region（abbr．Xinjiang）, a large-scale wide-width seedbed pre-sowing soil preparation machine has been designed and developed to complement high-horsepower tractors to meet practical demands of modernization in soil preparation equipment．Three-dimensional model software Solidwworks' parameterization and feature modelling functions were emplyed to establish a three-dimensional complete machine model of combined soil preparation machine．A physical prototype was designed for field performance experiment and model validation, optimizing key factors influencing machine's working performance and determining optimal combination between each factor．Results showed that under conditions of traveling speed of 12 km/h, an offset angle of 8° for gap harrows front row, and an offset angle of 10 ° for disc harrows rear rake row, wide-width seedbed pre-sowing soil preparation machine achieved excellent surface leveling effects．Through multiple multifunctional components combination, wide-width seedbed pre-sowing soil preparation machine realized multiple processes such as stubble removal, soil broken, loosening, leveling, and rolling in a single operation．This avoided heavy agricultural machinery equipment repeatedly compacting cultivated soil, reduce power consumption of tractor, and improved work efficiency．After machine operation, surface soil has became finer and smoother, providing an optimal ecological environment for subsequent seedbed preparation, dry seeding with wet emergence, drip irrigation system installation, and crop growth．