The work aims to explore the evolution of knowledge networks of design platform under the ecological mode of swarm intelligence design. The modeling method of ecological complex knowledge network of swarm intelligence design is studied and the evolution process of knowledge network of swarm intelligence design platform and the influence of designers' network on knowledge network are deeply analyzed through cases. By collecting data from top-ranked design works in ZCOOL, the knowledge genes were extracted and the knowledge networks, designers' networks and complex designer-product knowledge networks across consecutive time slices from 2017 to 2024 were constructed. The network metrics such as average degree, network diameter, and modularity were utilized to analyze the evolution of the knowledge network. It was found that the knowledge network of swarm intelligence design ecosystem showed an overall growth trend, which revealed the dynamic development of knowledge network. Through a comprehensive analysis of the complex designer-knowledge network, it was found that interactions between groups and individuals played a pivotal role in expanding and deepening the knowledge network. In conclusion, this study enhances the understanding of the evolution of knowledge networks of swarm intelligence design ecosystem, underscores the importance of designer interactions in fostering knowledge innovation, and provides theoretical basis for optimizing design platforms.