In order to further improve the operational efficiency of film-laying precision seeding and solve the problems of inconvenient road access and difficult steering in the field, a parallel-folding wide-width film-laying precision seeding machine was improved and designed, which can complete the processes of seed bed shaping, furrowing and film-laying and belt laying, sowing and mulching in one operation. The structure and working principle of the seeding machine were described, and the key components such as profiling mechanism, wide frame, lifting device and hydraulic system were designed and analyzed, and the dimensions of each component and the key factors affecting the smoothness of the lifting process were determined;the rigid-flexible coupling analysis was carried out on the unfolding and lifting process of the whole machine through the ADAMS software to get the position of the maximum stress point of the wide frame and the deformation curve of the slide beam in the unfolding process. In order to verify the operational performance of the folded cotton wide film spreading planter, field tests were conducted on its film spreading, tape spreading and seeding performance, and the test results showed that the qualification rate of the width of the picking surface was 92.1%, the rate of single grain was 96.4%, the qualification rate of the depth of seeding under the film was 95.7%, the qualification rate of the distance between holes was 96.3% and the rate of the longitudinal stretching of the drip irrigation belt was 0.73%, which met the industry standards and agronomic requirements, and it can be used for the work of agricultural machinery in the work of a larger width. It can provide reference for the design and improvement of agricultural machinery with large working width and the need of parallel folding.