Abstract: Intellectual property service is an important support for enterprises to enhance their technological innovation ability and maintain the advantages of intellectual property rights. Therefore, cooperative innovation behavior in intellectual property service has become an inevitable choice for enterprises. Based on the theory of planned behavior, the author finds out the influencing factors of cooperative innovation behavior in intellectual property service, constructs the theoretical model of cooperative innovation behavior of intellectual property service, and uses structural equation analysis to reveal the mechanism of cooperative innovation behavior in intellectual property service, as well as verify the intermediary role of cooperative willingness in the process of cooperative innovation forming. The results of empirical research show that the variables such as behavioral attitude, subjective norms and perceived behavior control influence the cooperative innovation behavior through the positive mediating effect of cooperative willingness; the expected results of behavioral attitude and the organizational effectiveness of perceived behavior control have no effect on cooperative willingness, while they can directly affect the cooperative innovation behavior positively. Finally, according to the research conclusion, it puts forward some policy suggestions, so as to provide theoretical guidance for strengthening the cooperative innovation behavior in the intellectual property service.