In order to optimize the rural public environment, protect and build the characteristics and integrity of the rural public environment. This paper introduces the development and research of a digital design platform based on digital computer, taking parallel robot (cross IV) as the object. The basic functional requirement of the digital integrated design platform is parallel robot. In the design stage, it mainly needs six functional modules, including conceptual design module, detailed design module, simulation design module, electromechanical coupling design module, optimization design module, and database module. Based on the analysis and summary of the digital integrated design process of parallel robot, combined with the actual functional requirements, the key technologies and solutions of the digital design platform are determined, the overall framework of the digital design platform is drawn up, and the implementation process of the platform is planned in detail. The Design personnel involved in the design process and their corresponding responsible contents, and the user authority is managed reasonably. Set the parameters of the driving arm and the driven arm. The outer diameter of the driving arm is 58 mm and the thickness is 2 mm. The outer diameter of the driven arm is 14 mm, and the thickness is 2 mm. Their length can be calculated directly according to the parameters provided in the conceptual design. According to the rules set by the software, the automatic assembly operation is carried out to obtain the whole machine model. After entering the SolidWorks motion module, the dynamic interference inspection is carried out first, and then the simulation analysis is carried out. The results show that the selection is correct when the actual model is consistent with the theoretical model. The correct selection and wide application of CAD technology in the production and construction of building decoration engineering will inevitably bring great changes in construction management and concept and become a new trend and trend for construction enterprises to enhance their competitiveness. The aforementioned computer-aided design is a broad application category. It provides a strong foundation for the design of rural public environment.