According to the different interest demands of various enterprises in the collaborative innovation of complex products, the evolutionary game model of interest distribution of collaborative innovation network of complex products is constructed based on the theories of complex network and public goods evolutionary game, and the evolution of cooperative behavior of network is simulated and analyzed. It is found that: when the demand of collaborative innovation cooperation is different, the structure of benefit distribution should be different; considering the input and importance of enterprises in the structure of benefit distribution can reduce the free riding behavior of enterprises; the initial strategy of backbone enterprises has a significant impact on the evolution of network cooperation behavior, and the overall level of network cooperation can be improved by mobilizing the enthusiasm of backbone enterprises.